MESA


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:CostsAndExpenses

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GeneralAndAdministrativeExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestExpense

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingIncomeLoss

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ProfitLoss

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ReceivablesNetCurrent

us-gaap:OtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:MajorPropertyClass, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LongTermDebt
us-gaap:DebtInstrument

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStocksIncludingAdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt
us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement
us-gaap:RepaymentsOfLongTermDebt
us-gaap:LineOfCreditFacility, us-gaap:SubsequentEventType
us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:TypeOfArrangement

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:Range
mesa:AdditionalCollateralCoverageRatio1

mesa:AircraftAndTrafficServicing

mesa:AirframeCheckExpense

mesa:AirframeCheckPassThroughExpense

mesa:AmortizationOfDebtFinancingCostsAndAccretionOfInterestOnNoninterestbearingSubordinatedNotes

mesa:AmortizationOfDeferredCredits

mesa:CARESActGrantRecognitionAmount
us-gaap:SubsequentEventType, us-gaap:VariableRate
mesa:CARESActOf2020SecuredLoanFacilityInterestRate
us-gaap:Range
mesa:CalculatedCollateralCoverageRatio1
us-gaap:TypeOfArrangement
mesa:DebtIssuanceCostsAllocatedToWarrants
us-gaap:Range, us-gaap:SubsidiarySaleOfStock
mesa:DefinedContributionPlanSemiAnnualContributionOfEligibleEmployeesCompensationPercent
us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement
mesa:DiscountForBalanceAmountOfLoans

mesa:EngineOverhaulExpense

mesa:EngineOverhaulPassThroughExpense

mesa:FlightOperationsExpense

mesa:IncreaseDecreaseInOperatingLeaseCost

mesa:IncreaseDecreaseInOperatingLeaseRightToUseAssets

mesa:MaximumPercentageOfStockPertainingToRestrictions

mesa:PaymentsOfDebtAndWarrantIssuance
us-gaap:SubsequentEventType
mesa:PayrollSupportProgramExtensionAmountGranted
us-gaap:SubsequentEventType
mesa:PayrollSupportProgramExtensionAmountReceived
us-gaap:PropertyPlantAndEquipmentByType
mesa:PercentageLeased

mesa:PercentageOfChangeInOperatingLeaseCost
us-gaap:LineOfCreditFacility, us-gaap:SubsequentEventType
mesa:RepaymentsOfPreviouslyDeferredPrincipalPayments

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued
us-gaap:StatementEquityComponents

us-gaap:AircraftMaintenanceMaterialsAndRepairs

us-gaap:AircraftRental

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalizedContractCostAmortization
us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1

us-gaap:ContractWithCustomerLiabilityRevenueRecognized
us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
us-gaap:DebtInstrument, us-gaap:TypeOfArrangement

us-gaap:DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction

us-gaap:DeferredIncomeTaxesAndTaxCredits
us-gaap:AircraftType
us-gaap:DeferredRevenueRevenueRecognized1
us-gaap:AircraftType, us-gaap:StatementScenario

us-gaap:Depreciation

us-gaap:DepreciationAndAmortization

us-gaap:FuelCosts

us-gaap:GainLossOnDispositionOfAssets

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncrementalCommonSharesAttributableToCallOptionsAndWarrants

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InventoryWriteDown

us-gaap:InvestmentIncomeInterest

us-gaap:OperatingLeaseCost
us-gaap:IncomeStatementLocation
us-gaap:OperatingLeaseLeaseIncome

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasesRentExpenseNet
us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement
us-gaap:PaymentsForLoans
us-gaap:MajorCustomers, us-gaap:FinancialInstrument, us-gaap:SubsequentEventType
us-gaap:PaymentsOfDebtExtinguishmentCosts

us-gaap:PaymentsOfFinancingCosts
us-gaap:CashAndCashEquivalents, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:ProceedsFromRepaymentsOfDebt
us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:RepaymentsOfLongTermDebtAndCapitalSecurities

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:SubsidiarySaleOfStock
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:StockRepurchasedDuringPeriodValue
us-gaap:StatementEquityComponents
us-gaap:SubsequentEventType
mesa:CARESActOf2020SecuredLoansAmount
us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement
mesa:CapitalizedDebtIssuanceCostsNet
us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:DebtInstrument, us-gaap:TypeOfArrangement
mesa:DebtInstrumentAdditionalAmountBorrowed
us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:DebtInstrument, us-gaap:TypeOfArrangement
us-gaap:TypeOfArrangement
us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:DebtInstrument, us-gaap:TypeOfArrangement
mesa:DebtInstrumentAmountBorrowed
us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:DebtInstrument, us-gaap:TypeOfArrangement
us-gaap:TypeOfArrangement

mesa:DeferredCreditsNoncurrent

mesa:DeferredTaxAssetsOperatingLease

mesa:DeferredTaxAssetsPrepaidAndOther

mesa:DeferredTaxLiabilitiesRightOfUseAssetsLease

mesa:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

mesa:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFour

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccruedVacationCurrent

us-gaap:AirlineRelatedInventory

us-gaap:AirlineRelatedInventoryNet

us-gaap:AirlineRelatedInventoryValuationReserves

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:CapitalLeasesBalanceSheetAssetsByMajorClassNet
us-gaap:TypeOfArrangement
us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerLiability

us-gaap:DebtInstrumentCarryingAmount
us-gaap:AircraftType, us-gaap:DebtInstrument
us-gaap:CreditFacility
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:DebtInstrumentFairValue
us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement
us-gaap:DebtInstrumentUnamortizedDiscount

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement
us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredOfferingCosts

us-gaap:DeferredRevenue

us-gaap:DeferredRevenueCurrent
us-gaap:BalanceSheetLocation

us-gaap:DeferredRevenueNoncurrent

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
us-gaap:IncomeTaxAuthority, us-gaap:TaxPeriod
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax

us-gaap:DeferredTaxAssetsTaxDeferredExpenseOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DepositLiabilitiesAccruedInterest

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:DebtInstrument, us-gaap:TypeOfArrangement

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
us-gaap:AircraftType, us-gaap:DebtInstrument
us-gaap:LongTermDebtPercentageBearingVariableInterestRate
us-gaap:DebtInstrument, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:Ownership
us-gaap:MinorityInterestOwnershipPercentageByParent

us-gaap:NotesAndLoansPayableCurrent

us-gaap:OperatingLossCarryforwardsValuationAllowance

us-gaap:OtherSundryLiabilitiesCurrent
us-gaap:ProductOrService, us-gaap:TypeOfArrangement
us-gaap:PurchaseObligation

us-gaap:RestrictedCash

us-gaap:RestrictedCashCurrent

us-gaap:RevenueRemainingPerformanceObligation
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:AwardType, us-gaap:PlanName

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Plots across concepts


IncomeStatement
Net Income Loss
Expenses
Allocated Share Based Compensation Expense
Balance Sheet
Intangible Assets Net Excluding Goodwill
Assets
Operating Lease Right Of Use Asset
Current Assets
Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Liabilities Current
Current Liabilities
Employee Related Liabilities Current
Noncurrent Liabilities
Other Liabilities Noncurrent
Stockholders Equity
Retained Earnings Accumulated Deficit
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Accounts Payable
NetCashProvidedByUsedInFinancingActivities
Payments For Repurchase Of Common Stock
Shares
Weighted Average Number Of Shares Outstanding Basic
NonoperatingIncomeExpense
Nonoperating Income Expense
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four

Tables

  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 36.647NA35.29935.26535.182NA35.11234.96234.821NA12.46223.5723.559NA23.223NANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 35.531NA35.29935.14135.023NA34.83534.69923.903NA12.46223.28211.294NA10.993NANA
us-gaap:EarningsPerShareBasic ▄▄▃▃▄▄▃▄▅▆▁▄█▄▇▄▅0.40.320.10.050.310.350.090.380.81.04-0.890.22.00.491.40.480.62
us-gaap:EarningsPerShareDiluted ▆▆▅▅▆▆▅▆▆▇▁▅█▅▇▅▅0.390.320.10.050.310.350.090.380.550.65-0.890.10.960.230.660.230.28
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
 TTM Greenblatt ROC _ _▆▅▄▃▆▆▄▇██▁▄▄▅26.97223.86415.22413.89227.18730.45317.07734.37739.2341.784-0.50816.34915.02322.691NANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:AllocatedShareBasedCompensationExpense ▂▂▂▂▂▂▂▂▂▁█▁▁▁▁0.90.91.01.21.31.21.51.31.50.311.60.50.50.60.0NANA
us-gaap:CostsAndExpenses ▅▃▁█▇▇▇▆▆▆█▇▇▆▅123.39984.17457.875166.004156.849157.377163.147142.77138.926135.748172.247151.291149.661134.605130.59NANA
us-gaap:GainsLossesOnExtinguishmentOfDebt 0.95NANANANA0.00.0-3.616NANANANANANANANANA
us-gaap:GeneralAndAdministrativeExpense ▄▄▃▄▄▃▃▄▃▂█▂▃▁▂13.07313.01311.73714.512.99612.40612.43513.47212.21410.31422.06610.33710.937.78610.534NANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▇▆▄▄▆▆▄▆██▁▄▄▅█18.93914.5474.9363.19214.3217.0583.86317.33525.0326.644-14.632.980.83510.1824.498NANA
us-gaap:IncomeTaxExpenseBenefit ▇▇▆▆▇▇▆▇▇█▅▆▁▇█4.8213.1721.5171.3073.5354.8150.8564.0865.9497.25-3.4950.608-21.7894.6999.065NANA
us-gaap:IncomeTaxesPaidNet ▁█▁▂▁▁█0.0010.3530.00.030.0150.0040.364NANA0.0170.322NANANANANANA
us-gaap:InterestExpense ▁▁▂▄▅▆▆▆██▇▆▇▅▄9.0829.45210.36811.67312.62813.60713.49613.77214.84215.27514.11813.34314.13112.45111.819NANA
us-gaap:InterestPaidNet ▁▄▂▆▃█▃█▅█▄█▃6.74311.1267.97312.9629.4415.9169.6515.67112.26615.47310.6915.7498.76NANANANA
us-gaap:NetIncomeLoss ▆▆▄▄▆▆▄▆▇▇▁▄█▄▇▄▅14.11811.3753.4191.88510.78512.2433.00713.24919.08119.394-11.1352.37222.6245.48215.4335.3046.61
us-gaap:NonoperatingIncomeExpense █▇▆▆▄▄▄▁▃▂▃▄▃▅▅-8.033-9.319-10.288-10.7-12.867-13.395-13.214-17.042-14.2-15.14-14.122-13.369-14.188-12.509-11.864NANA
us-gaap:OperatingIncomeLoss ▆▅▄▃▆▆▄▇██▁▄▄▅▇▄▅26.97223.86415.22413.89227.18730.45317.07734.37739.2341.784-0.50816.34915.02322.69136.36220.40520.838
us-gaap:OtherNonoperatingIncomeExpense █▄▄█▂▃▁▄▆▄▃▃▃0.9230.1230.0790.937-0.297-0.101-0.4510.0470.4860.051-0.015-0.036-0.066NANANANA
us-gaap:ProfitLoss ▆▅▂▁▅▅▁▆█14.11811.3753.4191.88510.78512.2433.00713.24919.081NANANANANANANANA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▆▃▁████▇▇▇▇▇▇▆▇▆▆150.371108.03973.099179.896184.036187.83180.224177.147178.156177.532171.739167.64164.684157.293166.952159.096160.235
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:Assets █▆▅▆▇▄▄▃▃▅▁1554.8171501.931495.3131511.741542.0011451.9171465.9831425.2861443.9621472.3881389.582NANA1357.649NANANA
us-gaap:Liabilities ▄▂▃▄▅▁▃▁▃▅█1070.521044.0711049.8191070.3881103.811026.0491053.2491016.0011048.8031097.9211156.959NANA1135.425NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▆▅▆▇▄▄▃▃▅▁1554.8171501.931495.3131511.741542.0011451.9171465.9831425.2861443.9621472.3881389.582NANA1357.649NANANA
us-gaap:StockholdersEquity █▇▇▇▇▆▆▆▆▅▁▂▂▁484.297457.859445.494441.352438.191425.868412.734409.285395.159374.467232.623248.704245.941222.224NANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:AssetsCurrent █▄▂▁▂▄▄▄▅▆▂236.003155.591112.55798.311112.234157.841158.151160.14173.653197.917122.368NANA145.839NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue █▄▂▂▂▂▃▃▃▄▁181.399.39564.93452.39957.76368.85579.90977.74388.6103.31141.731NA78.99156.78822.92NANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents █▄▂▂▂▂▃▃▃▄▁▂▃▂184.934102.84168.37855.8461.21172.50183.55681.38992.244107.13445.55456.52782.81960.347NANANA
us-gaap:ReceivablesNetCurrent ▅▄▄▄██▂▃▁▄▇15.41213.71214.61814.18224.12123.087.90212.0716.01514.2921.596NANA8.853NANANA
us-gaap:OtherAssetsCurrent ▆█▃▂▁▁▁▃▁▂▂11.76814.8065.7564.3972.8383.0453.055.4732.7444.2025.315NANA6.017NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▂▃▁▁▁▇██▇▇▇12.89716.0677.1435.9114.50240.92346.42547.45143.01840.91439.502NANA61.525NANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:PropertyPlantAndEquipmentGross ███▇▇▇▇▄▃▃▁1607.3291606.1171607.9661598.3441598.2331592.0431586.521532.1011525.0511511.0931483.739NANA1396.813NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment █▇▆▆▅▄▃▃▂▂▁413.268393.702374.239355.547336.966318.458300.498294.486277.267260.264244.191NANA204.365NANANA
us-gaap:AmortizationOfIntangibleAssets ▄▆▆▆▆▆███▁▁▁▁▁▁0.30.40.40.40.40.40.50.50.50.10.10.10.10.10.1NANA
us-gaap:PropertyPlantAndEquipmentNet ▁▂▄▅▆▇█▄▅▅▄1194.0611212.4151233.7271242.7971261.2671273.5851286.0221237.6151247.7841250.8291239.548NANA1192.448NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▂▂▃▄▄▅▆▇██7.7228.0328.4078.7829.1579.5329.98410.43710.88911.34111.437NANA11.724NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▃▅▇█114.666123.251131.48140.753146.071NANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▁▁▅▅▆▆▇▇▇▇█0.5140.7427.0217.1248.48.7929.84910.1789.7989.70311.611NANA5.693NANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:AccountsPayableCurrent ▆█▃▆▆▇▁▃▃█▅47.57653.22939.91849.24647.7549.9333.58540.52740.43954.30744.654NANA44.738NANANA
us-gaap:LiabilitiesCurrent ▄█▅▅▅▃▂▁▁▂▂287.896353.326308.046300.609295.911256.706245.852226.66231.218251.381246.877NANA218.213NANANA
us-gaap:LongTermDebtCurrent ▁█▇▆▆▆▆▅▅▅▅99.745189.268176.896168.171166.089165.9163.623147.114149.842155.17149.936NANA140.466NANANA
us-gaap:OperatingLeaseLiabilityCurrent █▄▁44.71243.93243.219NANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▄█▄▁▃▁▃▁▂▂▁37.58154.86737.66327.13834.3528.88834.15227.34431.01729.69628.649NANA23.929NANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:LiabilitiesNoncurrent ▄▁▃▄▅▄▅▄▅▆█782.624690.745741.773769.779807.899769.343807.397789.341817.585846.54910.082NANA917.212NANANA
us-gaap:LongTermDebt ▁▁▂▃▃▄▅▄▅▆█723.861731.724763.773787.964807.106858.145896.73857.841891.692930.207994.102NANA956.918NANANA
us-gaap:LongTermDebtNoncurrent ▃▁▂▃▃▄▅▅▆▆█624.116542.456586.877619.793641.017677.423717.546696.856727.839760.177828.487NANA803.874NANANA
us-gaap:LongTermDebtAndCapitalLeaseObligations ▄▁▂▃▄▅▇▆▇█624.116542.456586.877619.793641.017677.423717.546696.856727.839760.177NANANA803.874NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet █▄▁69.11164.27561.203NANA55.303NANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▂▁▁▁▁▆▆▇▇██4.1471.4091.031.2551.35224.48325.75527.96929.58431.17333.306NANA39.713NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▅█53.5762.53171.068NANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo ▁█15.97333.216NANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ▁█14.68215.947NANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▁█1.49414.682NANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NA1.654NANANANANANANANANANANANANANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:StockholdersEquity █▇▇▇▇▆▆▆▆▅▁▂▂▁484.297457.859445.494441.352438.191425.868412.734409.285395.159374.467232.623248.704245.941222.224NANANA
us-gaap:CommonStocksIncludingAdditionalPaidInCapital █▇▇▇▇▇▇▇▇▇▁255.092242.772241.782241.059239.783238.504237.613237.171236.294234.683112.732NANA114.456NANANA
us-gaap:RetainedEarningsAccumulatedDeficit █▇▆▆▆▅▅▄▃▂▁229.205215.087203.712200.293198.408187.364175.121172.114158.865139.784119.891NANA107.768NANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▇▄▂▄▄▄▂▄▆▂▁▃▃79.27371.06138.39926.97238.2337.59944.30725.62544.14555.77621.95513.09628.11235.987NANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ███▇▇▇▂█▆▅▁▇▇▇-1.773-1.553-0.341-11.945-12.828-8.809-77.5421.838-20.329-37.381-84.491-6.728-10.227-16.463NANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▁▂▂▁▁▇▁▁▇█▂▄▅4.593-35.045-25.52-20.398-36.692-39.84535.402-38.318-38.70643.18551.299-32.664.58714.344NANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect █▅▄▂▂▂▃▂▂▇▂▁▄82.09334.46312.538-5.371-11.29-11.0552.167-10.855-14.8961.58-10.973-26.29222.472NANANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:IncreaseDecreaseInAccountsPayable ▂▇▁▄▃█▃▃▃▂▄▅▄▅-5.72313.308-9.2881.734-2.33617.007-1.437-0.622-2.829-5.9341.6763.982.7057.248NANANA
us-gaap:IncreaseDecreaseInInventories ▁▂▂▂▅▆▅██▂▃▂▃▅-0.2560.1260.0210.2241.1581.2341.1862.0241.8660.0670.2870.1040.2861.114NANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities █▇▄▂▄▄▄▂▄▆▂▁▃▃79.27371.06138.39926.97238.2337.59944.30725.62544.14555.77621.95513.09628.11235.987NANANA
us-gaap:NetIncomeLoss ▆▆▄▄▆▆▄▆▇▇▁▄█▄▇▄▅14.11811.3753.4191.88510.78512.2433.00713.24919.08119.394-11.1352.37222.6245.48215.4335.3046.61
us-gaap:ProfitLoss ▆▅▂▁▅▅▁▆█14.11811.3753.4191.88510.78512.2433.00713.24919.081NANANANANANANANA
us-gaap:ShareBasedCompensation ▁▁▁▁▂▂▂▂▂█▁▁▁▁0.850.8811.021.1931.321.2491.5071.2981.45411.720.390.3910.4280.403NANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ███▇▇▇▂█▆▅▁▇▇▇-1.773-1.553-0.341-11.945-12.828-8.809-77.5421.838-20.329-37.381-84.491-6.728-10.227-16.463NANANA
us-gaap:PaymentsToAcquireProductiveAssets ▁▁▂▁▂▂█▂▃▃█▁▂▃1.7731.50712.1922.84410.1248.61982.4818.21426.03619.4881.5316.66610.31219.681NANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▁▂▂▁▁▇▁▁▇█▂▄▅4.593-35.045-25.52-20.398-36.692-39.84535.402-38.318-38.70643.18551.299-32.664.58714.344NANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt █▁▁195.00.00.0NANA8.072.458NANA0.0102.262NANA52.452NANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:AssetsSoldUnderAgreementsToRepurchase,us-gaap:TypeOfArrangement mesa:EDCLoans,mesa:LoanAgreementNANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:LineOfCreditFacility,us-gaap:SubsequentEventType mesa:ExportDevelopmentCanada,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:SubsequentEventType,us-gaap:TypeOfArrangement us-gaap:SubsequentEvent,mesa:LoanAgreementNANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:TypeOfArrangement mesa:LoanAgreementNANANANANANANANANANANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▁▁▃▂▁▃█0.0190.0880.2970.160.0410.3571.065NANA4.453NANANA0.24NANANA
  2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-06-30
Value3635353535343412232323
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-06-30
Value3535353534342312231110
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value0.40.320.10.050.310.350.090.380.81.04-0.890.22.00.491.40.480.62
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value0.390.320.10.050.310.350.090.380.550.65-0.890.10.960.230.660.230.28
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.90.91.01.21.31.21.51.31.50.3110.50.50.60.0
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.81.40.70.70.60.80.70.80.26.80.30.30.40.0

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1238457166156157163142138135172151149134130
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax82.177.979.292.385.283.890.580.678.076.5100.390.290.985.678.2

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt


Gains
Period End2020-12-312019-09-302019-06-302019-03-31
Value950000.000-3616000.0
Percentage of GainsLossesOnExtinguishmentOfDebt100.00.00.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.00.0-2.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value131311141212121312102210107.78610
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.712.016.18.17.16.66.97.66.95.812.86.26.64.96.3

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value18144.9363.19214173.863172526-14.632.980.8351024
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.613.56.81.87.89.12.19.814.015.0-8.51.80.56.514.7

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value4.8213.1721.5171.3073.5354.8150.8564.0865.9497.25-3.4950.608-21.7894.6999.065
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.22.92.10.71.92.60.52.33.34.1-2.00.4-13.23.05.4

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-302018-06-30
Value1000.0353000.0030000.015000.04000.0364000.017000.0322000.0
Percentage of IncomeTaxesPaidNet100.0100.00.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.30.00.00.00.00.20.00.2

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value9.0829.45210111213131314151413141211
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.08.714.26.56.97.27.57.88.38.68.28.08.67.97.1

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value6.743117.973129.44159.6515121510158.76
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.510.310.97.25.18.55.48.86.98.76.29.45.3

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value14113.4191.88510123.007131919-11.1352.372225.482155.3046.61
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.410.54.71.05.96.51.77.510.710.9-6.51.413.73.59.23.34.1

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-31
Value143.4191.885103.0071319-11.1352.37222
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.44.71.05.91.77.510.7-6.51.413.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-8033000.0-9319000.0-10288000.0-10700000.0-12867000.0-13395000.0-13214000.0-17042000.0-14200000.0-15140000.0-14122000.0-13369000.0-14188000.0-12509000.0-11864000.0
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.3-8.6-14.1-5.9-7.0-7.1-7.3-9.6-8.0-8.5-8.2-8.0-8.6-8.0-7.1

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value26231513273017343941-0.508161522362020
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.922.120.87.714.816.29.519.422.023.5-0.39.89.114.421.812.813.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value923000.0123000.079000.0937000.0-297000.0-101000.0-451000.047000.0486000.051000.0-15000.0-36000.0-66000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.10.10.5-0.2-0.1-0.30.00.30.0-0.0-0.0-0.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value14113.4191.88510123.0071319
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.410.54.71.05.96.51.77.510.7

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value15010873179184187180177178177171167164157166159160
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

mesa:ContractRevenue


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value1279771165171172170169170168159156154151157154155
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax84.690.198.092.293.491.794.595.895.794.993.193.493.796.494.396.997.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax84.690.198.092.293.491.794.595.895.794.993.193.493.796.494.396.997.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mesa:ContractRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mesa:PassThroughAndOther


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value23101.4511412159.8587.3767.7079.0881111105.7179.542
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.49.92.07.86.68.35.54.24.35.16.96.66.33.65.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.49.92.07.86.68.35.54.24.35.16.96.66.33.65.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax mesa:PassThroughAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value155415011495151115421451146514251443147213891357
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value107010441049107011031026105310161048109711561135
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets68.969.570.270.871.670.771.871.372.674.683.383.6

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value155415011495151115421451146514251443147213891357
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-09-302015-09-30
Value484457445441438425412409395374232248245222189171
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets31.130.529.829.228.429.328.228.727.425.416.70.00.016.40.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-09-302015-09-30
Value255242241241239238237237236234112115114114114114
Percentage of StockholdersEquity52.753.054.354.654.756.057.657.959.862.748.546.446.751.560.466.4
Percentage of Assets16.416.216.215.915.616.416.216.616.415.98.10.00.08.40.00.0
Percentage of Assets us-gaap:CommonStockIncludingAdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-09-302015-09-30
Value2292152032001981871751721581391191331311077457
Percentage of StockholdersEquity47.347.045.745.445.344.042.442.140.237.351.553.653.348.539.633.6
Percentage of Assets14.714.313.613.212.912.911.912.111.09.58.60.00.07.90.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value23615511298112157158160173197122145
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets15.210.47.56.57.310.910.811.212.013.48.810.7

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-09-302015-09-30
Value1819964525768797788103417856223758
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.76.64.33.53.74.75.55.56.17.03.00.04.20.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-09-30
Value184102685561728381921074556826041
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.96.84.63.74.05.05.75.76.47.33.30.00.04.40.0

Receivables Net Current

us-gaap:ReceivablesNetCurrent

us-gaap:ReceivablesNetCurrent


Receivables
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value1513141424237.902126.01514218.853
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.00.91.00.91.61.60.50.80.41.01.60.7

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value11145.7564.3972.8383.0453.055.4732.7444.2025.3156.017
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.81.00.40.30.20.20.20.40.20.30.40.4

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value12167.1435.9114.50240464743403961
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.81.10.50.40.32.83.23.33.02.82.84.5

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value160716061607159815981592158615321525151114831396
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets103.4106.9107.5105.7103.6109.7108.2107.5105.6102.6106.8102.9

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

mesa:AircraftAndOtherFlightEquipmentSubstantiallyPledged


Property
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value1597159615881582157715221516150214751388
Percentage of PropertyPlantAndEquipmentGross99.499.499.499.499.499.499.599.599.499.4
Percentage of Assets102.7106.3103.0109.0107.6106.8105.0102.1106.2102.3
Percentage of Assets mesa:AircraftAndOtherFlightEquipmentSubstantiallyPledged0.00.00.00.00.00.00.00.00.00.0

us-gaap:FurnitureAndFixtures


Property
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value0.3020.3020.3030.3020.3020.3020.2910.2870.2870.2870.2870.251
Percentage of PropertyPlantAndEquipmentGross0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:FurnitureAndFixtures0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Property
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value2.7632.7632.7632.7972.7972.7972.7972.8362.8362.7542.7462.746
Percentage of PropertyPlantAndEquipmentGross0.20.20.20.20.20.20.20.20.20.20.20.2
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.2
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherMachineryAndEquipment


Property
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value5.1765.1475.3235.1225.1225.1224.7574.6313.7073.7213.7433.383
Percentage of PropertyPlantAndEquipmentGross0.30.30.30.30.30.30.30.30.20.20.30.2
Percentage of Assets0.30.30.40.30.30.40.30.30.30.30.30.2
Percentage of Assets us-gaap:OtherMachineryAndEquipment0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Vehicles


Property
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value0.9951.0320.9620.9620.9450.9240.9240.8980.8420.6920.6920.744
Percentage of PropertyPlantAndEquipmentGross0.10.10.10.10.10.10.10.10.10.00.00.1
Percentage of Assets0.10.10.10.10.10.10.10.10.10.00.00.1
Percentage of Assets us-gaap:Vehicles0.00.00.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value413393374355336318300294277260244204
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.626.225.023.521.921.920.520.719.217.717.615.1

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value300000.0400000.0400000.0400000.0400000.0400000.0500000.0500000.0500000.0100000.0100000.0100000.0100000.0100000.0100000.0
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value119412121233124212611273128612371247125012391192
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets76.880.782.582.281.887.787.786.886.485.089.287.8

us-gaap:PropertyPlantAndEquipmentNet us-gaap:MajorPropertyClass, us-gaap:PropertyPlantAndEquipmentByType

mesa:PledgedAsCollateral, us-gaap:AirTransportationEquipment


Property
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value10771093111411681081120312031125114010471170
Percentage of PropertyPlantAndEquipmentNet90.290.290.394.085.794.593.591.091.483.894.4
Percentage of Assets69.372.874.577.370.182.982.179.079.071.184.2
Percentage of Assets mesa:PledgedAsCollateral us-gaap:AirTransportationEquipment0.00.00.00.00.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value7.7228.0328.4078.7829.1579.5329.9841010111111
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.60.60.60.70.70.70.80.80.80.9

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value114123131140146
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0
Percentage of Assets7.48.28.89.39.5

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value0.5140.7427.0217.1248.48.7929.849109.7989.703115.693
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.50.50.50.60.70.70.70.70.80.4

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value475339494749334040544444
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.13.52.73.33.13.42.32.82.83.73.23.3

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value287353308300295256245226231251246218
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.523.520.619.919.217.716.815.916.017.117.816.1

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value99189176168166165163147149155149140
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.412.611.811.110.811.411.210.310.410.510.810.3

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2020-12-312020-09-302020-06-30
Value444343
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0
Percentage of Assets2.92.92.9

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value375437273428342731292823
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.43.72.51.82.22.02.31.92.12.02.11.8

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LiabilitiesNoncurrent


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value782690741769807769807789817846910917
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets50.346.049.650.952.453.055.155.456.657.565.567.6

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value723731763787807858896857891930994956
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets46.648.751.152.152.359.161.260.261.863.271.570.5

us-gaap:LongTermDebt us-gaap:DebtInstrument

mesa:EquipmentNotes


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value172172181181191191200200209209217
Percentage of LongTermDebt23.823.523.823.123.722.322.323.323.522.521.9
Percentage of Assets11.111.512.212.012.413.213.714.114.514.215.7
Percentage of Assets mesa:EquipmentNotes0.00.00.00.00.00.00.00.00.00.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value624542586619641677717696727760828803
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.136.139.241.041.646.748.948.950.451.659.659.2

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-09-30
Value624542586619641677717696727760803
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.136.139.241.041.646.748.948.950.451.659.2

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2020-12-312020-09-302020-06-302019-09-30
Value69646155
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0
Percentage of Assets4.44.34.13.8

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value4.1471.4091.031.2551.35224252729313339
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.10.10.10.11.71.82.02.02.12.42.9

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2020-12-312020-09-302020-06-30
Value536271
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0
Percentage of Assets3.44.24.8

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-312020-09-30
Value1533
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0
Percentage of Assets1.02.2

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-312020-09-30
Value1415
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0
Percentage of Assets0.91.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-312020-09-30
Value1.49414
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0
Percentage of Assets0.11.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-09-30
Value1654000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-312020-09-302020-06-30
Value98106114
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0
Percentage of Assets6.37.17.6

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-312020-09-30
Value5364000.06413000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0
Percentage of Assets0.30.4

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-09-302015-09-30
Value484457445441438425412409395374232248245222189171
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets31.130.529.829.228.429.328.228.727.425.416.70.00.016.40.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-09-302015-09-30
Value255242241241239238237237236234112115114114114114
Percentage of StockholdersEquity52.753.054.354.654.756.057.657.959.862.748.546.446.751.560.466.4
Percentage of Assets16.416.216.215.915.616.416.216.616.415.98.10.00.08.40.00.0
Percentage of Assets us-gaap:CommonStockIncludingAdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-09-302015-09-30
Value2292152032001981871751721581391191331311077457
Percentage of StockholdersEquity47.347.045.745.445.344.042.442.140.237.351.553.653.348.539.633.6
Percentage of Assets14.714.313.613.212.912.911.912.111.09.58.60.00.07.90.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stocks Including Additional Paid In Capital

us-gaap:CommonStocksIncludingAdditionalPaidInCapital

us-gaap:CommonStocksIncludingAdditionalPaidInCapital


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value255242241241239238237237236234112114
Percentage of CommonStocksIncludingAdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.416.216.215.915.616.416.216.616.415.98.18.4

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value229215203200198187175172158139119107
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.714.313.613.212.912.911.912.111.09.58.67.9

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value7971382638374425445521132835
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.765.852.515.020.820.024.614.524.831.412.87.817.122.9

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-1773000.0-1553000.0-341000.0-11945000.0-12828000.0-8809000.0-77542000.01838000.0-20329000.0-37381000.0-84491000.0-6728000.0-10227000.0-16463000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.2-1.4-0.5-6.6-7.0-4.7-43.01.0-11.4-21.1-49.2-4.0-6.2-10.5

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4.593-35.045-25.52-20.398-36.692-39.84535-38.318-38.7064351-32.664.58714
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.1-32.4-34.9-11.3-19.9-21.219.6-21.6-21.724.329.9-19.52.89.1

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value823412-5.371-11.29-11.0552.167-10.855-14.8961-10.973-26.29222
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax54.631.917.2-3.0-6.1-5.91.2-6.1-8.434.7-6.4-15.713.6

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-5.72313-9.2881.734-2.33617-1.437-0.622-2.829-5.9341.6763.982.7057.248
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-256000.0126000.021000.0224000.01158000.01234000.01186000.02024000.01866000.067000.0287000.0104000.0286000.01114000.0
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value7971382638374425445521132835
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.765.852.515.020.820.024.614.524.831.412.87.817.122.9

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value14113.4191.88510123.007131919-11.1352.372225.482155.3046.61
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.410.54.71.05.96.51.77.510.710.9-6.51.413.73.59.23.34.1

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-31
Value143.4191.885103.0071319-11.1352.37222
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.44.71.05.91.77.510.7-6.51.413.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value14113.4191.88510123.0071319
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.410.54.71.05.96.51.77.510.7

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.850.8811.021.1931.321.2491.5071.2981.454110.390.3910.4280.403
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-1773000.0-1553000.0-341000.0-11945000.0-12828000.0-8809000.0-77542000.01838000.0-20329000.0-37381000.0-84491000.0-6728000.0-10227000.0-16463000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.2-1.4-0.5-6.6-7.0-4.7-43.01.0-11.4-21.1-49.2-4.0-6.2-10.5

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1.7731.507122.844108.619828.2142619816.6661019
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value4.593-35.045-25.52-20.398-36.692-39.84535-38.318-38.7064351-32.664.58714
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.1-32.4-34.9-11.3-19.9-21.219.6-21.6-21.724.329.9-19.52.89.1

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2020-12-312020-09-302020-06-302019-09-302019-06-302018-09-302018-06-302017-09-30
Value1950.00.08.0720.010252
Percentage of ProceedsFromIssuanceOfLongTermDebt100.00.00.0100.0100.00.0100.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement

us-gaap:RepaymentsOfLongTermDebt

mesa:EDCLoans, mesa:LoanAgreement


Repayments
Period End2020-11-13
Value1.0
Percentage of RepaymentsOfLongTermDebt100.0

us-gaap:RepaymentsOfLongTermDebt us-gaap:LineOfCreditFacility, us-gaap:SubsequentEventType

mesa:ExportDevelopmentCanada, us-gaap:SubsequentEvent


Repayments
Period End2020-10-01
Value145
Percentage of RepaymentsOfLongTermDebt0.0

us-gaap:RepaymentsOfLongTermDebt us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:SubsequentEvent, mesa:LoanAgreement


Repayments
Period End2020-11-12
Value164
Percentage of RepaymentsOfLongTermDebt0.0

us-gaap:RepaymentsOfLongTermDebt us-gaap:TypeOfArrangement

mesa:LoanAgreement


Repayments
Period End2020-11-12
Value167
Percentage of RepaymentsOfLongTermDebt0.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-302017-09-30
Value19000.088000.0297000.0160000.041000.0357000.01065000.04453000.0240000.0
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-06-30
Value25.50.3070.4090.2470.2220.2360.2380.2390.204-26.0950.37
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value64553956
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value141117106134
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-09-302019-09-302018-09-302017-09-302016-09-302015-09-30
Value4866000.04688000.04688000.07547000.07547000.07547000.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value3063000.01890000.01940000.02586000.0
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0

mesa:AdditionalCollateralCoverageRatio1 us-gaap:Range

mesa:AdditionalCollateralCoverageRatio1

srt:Minimum


Additional
Period End2020-10-30
Value1.6
Percentage of AdditionalCollateralCoverageRatio1100.0

mesa:AircraftAndTrafficServicing

mesa:AircraftAndTrafficServicing


Aircraft
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value901000.0418000.0538000.01336000.01064000.0995000.0978000.01065000.0934000.0949000.0848000.0783000.0961000.0918000.01178000.0
Percentage of AircraftAndTrafficServicing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mesa:AirframeCheckExpense

mesa:AirframeCheckExpense


Airframe
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value102.92.9107.36.64.44.71.51.76.37.95.65.76.7
Percentage of AirframeCheckExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mesa:AirframeCheckPassThroughExpense

mesa:AirframeCheckPassThroughExpense


Airframe
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value7100000.01300000.0800000.03900000.01200000.0400000.0000200000.01600000.02700000.03000000.02300000.02200000.0
Percentage of AirframeCheckPassThroughExpense100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0

mesa:AmortizationOfDebtFinancingCostsAndAccretionOfInterestOnNoninterestbearingSubordinatedNotes

mesa:AmortizationOfDebtFinancingCostsAndAccretionOfInterestOnNoninterestbearingSubordinatedNotes


Amortization
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1020000.01033000.01095000.01054000.01056000.01147000.0958000.01042000.01029000.0941000.0867000.01769000.01361000.0
Percentage of AmortizationOfDebtFinancingCostsAndAccretionOfInterestOnNoninterestbearingSubordinatedNotes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mesa:AmortizationOfDeferredCredits

mesa:AmortizationOfDeferredCredits


Amortization
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value793000.0814000.0887000.0938000.01103000.01267000.01279000.01387000.01188000.0
Percentage of AmortizationOfDeferredCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0

mesa:CARESActGrantRecognitionAmount

mesa:CARESActGrantRecognitionAmount


C
Period End2020-12-312020-09-302020-06-30
Value114043
Percentage of CARESActGrantRecognitionAmount100.0100.0100.0

mesa:CARESActOf2020SecuredLoanFacilityInterestRate us-gaap:SubsequentEventType, us-gaap:VariableRate

mesa:CARESActOf2020SecuredLoanFacilityInterestRate

us-gaap:SubsequentEvent, us-gaap:LondonInterbankOfferedRateLIBOR


C
Period End2020-10-31
Value3.5
Percentage of CARESActOf2020SecuredLoanFacilityInterestRate100.0

mesa:CalculatedCollateralCoverageRatio1 us-gaap:Range

mesa:CalculatedCollateralCoverageRatio1

srt:Maximum


Calculated
Period End2020-10-30
Value1.6
Percentage of CalculatedCollateralCoverageRatio1100.0

mesa:DebtIssuanceCostsAllocatedToWarrants us-gaap:TypeOfArrangement

mesa:DebtIssuanceCostsAllocatedToWarrants

mesa:LoanAgreement


Debt
Period End2020-12-31
Value100000.0
Percentage of DebtIssuanceCostsAllocatedToWarrants100.0

mesa:DefinedContributionPlanSemiAnnualContributionOfEligibleEmployeesCompensationPercent us-gaap:Range, us-gaap:SubsidiarySaleOfStock

mesa:DefinedContributionPlanSemiAnnualContributionOfEligibleEmployeesCompensationPercent

srt:Maximum, us-gaap:EmployeeStock


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value15.014.85000.15
Percentage of DefinedContributionPlanSemiAnnualContributionOfEligibleEmployeesCompensationPercent100.0100.00.00.0100.0

srt:Minimum, us-gaap:EmployeeStock


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value1.00.99000.01
Percentage of DefinedContributionPlanSemiAnnualContributionOfEligibleEmployeesCompensationPercent6.76.70.00.06.7

mesa:DiscountForBalanceAmountOfLoans us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement

mesa:DiscountForBalanceAmountOfLoans

mesa:EDCLoans, mesa:LoanAgreement


Discount
Period End2020-11-12
Value3600000.0
Percentage of DiscountForBalanceAmountOfLoans100.0

mesa:EngineOverhaulExpense

mesa:EngineOverhaulExpense


Engine
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value14123.214109.3115.24.15.0131319108.4
Percentage of EngineOverhaulExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mesa:EngineOverhaulPassThroughExpense

mesa:EngineOverhaulPassThroughExpense


Engine
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value9.64.00.40.71.93.01.9-0.41.52.54.62.92.30.30.0
Percentage of EngineOverhaulPassThroughExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

mesa:FlightOperationsExpense

mesa:FlightOperationsExpense


Flight
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value363429525255534953535154494537
Percentage of FlightOperationsExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mesa:IncreaseDecreaseInOperatingLeaseCost

mesa:IncreaseDecreaseInOperatingLeaseCost


Increase
Period End2020-12-312020-06-302020-03-31
Value-2945000.0-2460000.0-131000.0
Percentage of IncreaseDecreaseInOperatingLeaseCost100.0100.0100.0

mesa:IncreaseDecreaseInOperatingLeaseRightToUseAssets

mesa:IncreaseDecreaseInOperatingLeaseRightToUseAssets


Increase
Period End2020-12-312019-12-31
Value404000.0329000.0
Percentage of IncreaseDecreaseInOperatingLeaseRightToUseAssets100.0100.0

mesa:MaximumPercentageOfStockPertainingToRestrictions

mesa:MaximumPercentageOfStockPertainingToRestrictions


Maximum
Period End2020-12-31
Value24.9
Percentage of MaximumPercentageOfStockPertainingToRestrictions100.0

mesa:PaymentsOfDebtAndWarrantIssuance

mesa:PaymentsOfDebtAndWarrantIssuance


Payments
Period End2020-12-312019-12-31
Value1257000.0184000.0
Percentage of PaymentsOfDebtAndWarrantIssuance100.0100.0

mesa:PayrollSupportProgramExtensionAmountGranted us-gaap:SubsequentEventType

mesa:PayrollSupportProgramExtensionAmountGranted

us-gaap:SubsequentEvent


Payroll
Period End2021-02-01
Value48
Percentage of PayrollSupportProgramExtensionAmountGranted100.0

mesa:PayrollSupportProgramExtensionAmountReceived us-gaap:SubsequentEventType

mesa:PayrollSupportProgramExtensionAmountReceived

us-gaap:SubsequentEvent


Payroll
Period End2021-02-08
Value24
Percentage of PayrollSupportProgramExtensionAmountReceived100.0

mesa:PercentageLeased us-gaap:PropertyPlantAndEquipmentByType

mesa:PercentageLeased

mesa:Aircraft


Percentage
Period End2020-12-31
Value11.0
Percentage of PercentageLeased100.0

mesa:PercentageOfChangeInOperatingLeaseCost

mesa:PercentageOfChangeInOperatingLeaseCost


Percentage
Period End2020-12-312020-06-302020-03-31
Value-17.5-0.136-0.007
Percentage of PercentageOfChangeInOperatingLeaseCost100.0100.0100.0

mesa:RepaymentsOfPreviouslyDeferredPrincipalPayments us-gaap:LineOfCreditFacility, us-gaap:SubsequentEventType

mesa:RepaymentsOfPreviouslyDeferredPrincipalPayments

mesa:ExportDevelopmentCanada, us-gaap:SubsequentEvent


Repayments
Period End2020-10-01
Value19
Percentage of RepaymentsOfPreviouslyDeferredPrincipalPayments100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition


Adjustments
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-31
Value850000.01020000.01193000.01320000.01507000.01298000.01454000.0390000.0391000.0428000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Adjustments
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-31
Value850000.01020000.01193000.01320000.01507000.01298000.01454000.0390000.0391000.0428000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued


Adjustments
Period End2020-12-31
Value11
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Adjustments
Period End2020-12-31
Value11
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued100.0

us-gaap:AircraftMaintenanceMaterialsAndRepairs

us-gaap:AircraftMaintenanceMaterialsAndRepairs


Aircraft
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value524722645857544539394851544646
Percentage of AircraftMaintenanceMaterialsAndRepairs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AircraftRental

us-gaap:AircraftRental


Aircraft
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value109.60615121111121414141718181818
Percentage of AircraftRental100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:AmortizationOfFinancingCostsAndDiscounts


Amortization
Period End2020-12-312019-12-31
Value1860000.01054000.0
Percentage of AmortizationOfFinancingCostsAndDiscounts100.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.001-0.038-0.2360.334-0.657-5.5090.715.63515
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedContractCostAmortization

us-gaap:CapitalizedContractCostAmortization


Capitalized
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value400000.0700000.0300000.0400000.0600000.0600000.0600000.0600000.0500000.0500000.0500000.0500000.0500000.0
Percentage of CapitalizedContractCostAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ConcentrationRiskPercentage1

mesa:AmericanAirlinesInc, us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk


Concentration
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-06-30
Value46.00.60.510.510.530.550.530.540.540.530.55
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

mesa:DHLNetworkOperations, us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk


Concentration
Period End2020-12-312019-12-31
Value1.00
Percentage of ConcentrationRiskPercentage12.20.0

mesa:UnitedAirlinesInc, us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk


Concentration
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-06-30
Value53.00.40.490.490.470.450.470.460.460.470.45
Percentage of ConcentrationRiskPercentage1115.266.796.196.188.781.888.785.285.288.781.8

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized


Contract
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value800000.0800000.0900000.0900000.01100000.01300000.01300000.01400000.01200000.01200000.01000000.01200000.01000000.0
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

mesa:SecuredTermLoanFacility, us-gaap:SubsequentEvent, mesa:LoanAgreement


Debt
Period End2020-10-30
Value3.5
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:DebtInstrument, us-gaap:TypeOfArrangement

mesa:SecuredTermLoanFacility, mesa:LoanAgreement


Debt
Period End2020-10-30
Value3.5
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction

us-gaap:DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction


Debt
Period End2020-12-31
Value1887000.0
Percentage of DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction100.0

us-gaap:DeferredIncomeTaxesAndTaxCredits

us-gaap:DeferredIncomeTaxesAndTaxCredits


Deferred
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value4.8363.3321.4121.2853.2054.6050.8594.0865.9534.265-3.4930.607-19.253
Percentage of DeferredIncomeTaxesAndTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredRevenueRevenueRecognized1 us-gaap:AircraftType

us-gaap:DeferredRevenueRevenueRecognized1

mesa:E175LLAircraft


Deferred
Period End2020-12-31
Value33
Percentage of DeferredRevenueRevenueRecognized1100.0

us-gaap:DeferredRevenueRevenueRecognized1 us-gaap:AircraftType, us-gaap:StatementScenario

mesa:E175LLAircraft, srt:ScenarioForecast


Deferred
Period End2021-03-31
Value48
Percentage of DeferredRevenueRevenueRecognized10.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value202020202020191818171515151515
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAndAmortization

us-gaap:DepreciationAndAmortization


Depreciation
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value202020202020191918171615151515
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FuelCosts

us-gaap:FuelCosts


Fuel
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value390000.0168000.0146000.0188000.0169000.0155000.0211000.0101000.0121000.0149000.0151000.0130000.068000.0152000.0214000.0
Percentage of FuelCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDispositionOfAssets

us-gaap:GainLossOnDispositionOfAssets


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-24000.0127000.0-14000.0-107000.0-407000.0-44000.016000.032000.01000.0-31000.0-78000.0-116000.0-82000.0-45000.0
Percentage of GainLossOnDispositionOfAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedLiabilities


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-12.637189.537-3.6695.791-7.512100.3-0.7990.36914-3.7641.2960.449
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInDeferredRevenue


Increase
Period End2020-12-31
Value53
Percentage of IncreaseDecreaseInDeferredRevenue100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-4.2960.1111.3540.23-0.327-7.1480.6175.2022.042-2.8574.701-2.538-6.892.47
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1.7-0.9060.557-10.0591.0415-4.1696.541-8.275-7.3064.5856.7161.442-7.059
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToCallOptionsAndWarrants

us-gaap:IncrementalCommonSharesAttributableToCallOptionsAndWarrants


Incremental
Period End2020-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.810-0.210.00.09812-0.0212
Percentage of IncrementalCommonSharesAttributableToCallOptionsAndWarrants100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value316000.0-23000.0-44000.0124000.0159000.0-68000.0277000.0263000.0309000.0-171000.0180000.0190000.0189000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWriteDown

us-gaap:InventoryWriteDown


Inventory
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-37000.0-19000.0209000.097000.0165000.0158000.0197000.0122000.0126000.012000.0062000.070000.0
Percentage of InventoryWriteDown100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInterest


Investment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value126000.010000.01000.036000.058000.0313000.0733000.0299000.0156000.084000.011000.010000.09000.09000.08000.0
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value13151816181819
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseLeaseIncome us-gaap:IncomeStatementLocation

us-gaap:OperatingLeaseLeaseIncome

mesa:ContractRevenue


Operating
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value495152535454
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2020-12-312020-09-302019-12-31
Value9.3049.2549.534
Percentage of OperatingLeasePayments100.0100.0100.0

us-gaap:OperatingLeasesRentExpenseNet

us-gaap:OperatingLeasesRentExpenseNet


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value131315181616181819232122212121
Percentage of OperatingLeasesRentExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForLoans us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement

us-gaap:PaymentsForLoans

mesa:EDCLoans, mesa:LoanAgreement


Payments
Period End2020-11-12
Value164
Percentage of PaymentsForLoans100.0

us-gaap:PaymentsOfDebtExtinguishmentCosts us-gaap:MajorCustomers, us-gaap:FinancialInstrument, us-gaap:SubsequentEventType

us-gaap:PaymentsOfDebtExtinguishmentCosts

mesa:UnitedAirlinesInc, mesa:UnitedCapacityPurchaseAgreement, us-gaap:SubsequentEvent


Payments
Period End2020-11-04
Value85
Percentage of PaymentsOfDebtExtinguishmentCosts100.0

us-gaap:PaymentsOfFinancingCosts

us-gaap:PaymentsOfFinancingCosts


Payments
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.3860.90.310.1840.812.332.2820.2580.0853.0890.2022.4761.012
Percentage of PaymentsOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfDebt us-gaap:CashAndCashEquivalents, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:ProceedsFromRepaymentsOfDebt

mesa:CashInHand, us-gaap:SubsequentEvent, mesa:LoanAgreement


Proceeds
Period End2020-11-12
Value82800.0
Percentage of ProceedsFromRepaymentsOfDebt100.0

us-gaap:ProceedsFromRepaymentsOfDebt us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:SubsequentEvent, mesa:LoanAgreement


Proceeds
Period End2020-11-12
Value81300.0
Percentage of ProceedsFromRepaymentsOfDebt98.2

us-gaap:RepaymentsOfLongTermDebtAndCapitalSecurities

us-gaap:RepaymentsOfLongTermDebtAndCapitalSecurities


Repayments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value189342442364633125386347406936
Percentage of RepaymentsOfLongTermDebtAndCapitalSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2020-12-312019-12-31
Value0.069142
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate us-gaap:SubsidiarySaleOfStock

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate

us-gaap:EmployeeStock


Share
Period End2020-12-31
Value10.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock


Share
Period End2020-12-31
Value4.59
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock


Share
Period End2020-12-31
Value7.71
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock


Share
Period End2020-12-31
Value7.37
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue100.0

us-gaap:StockRepurchasedDuringPeriodValue

us-gaap:StockRepurchasedDuringPeriodValue


Stock
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-06-30
Value19000.0297000.0160000.041000.01065000.0449000.03259000.0
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:CommonStock


Stock
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-30
Value20000.0100000.0460000.0040000.0400000.01000000.04500000.0
Percentage of StockRepurchasedDuringPeriodValue105.30.0154.90.097.60.093.90.0

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Stock
Period End2020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-06-30
Value19000.0297000.0160000.041000.01065000.0449000.03259000.0
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0

mesa:CARESActOf2020SecuredLoansAmount us-gaap:SubsequentEventType

mesa:CARESActOf2020SecuredLoansAmount

us-gaap:SubsequentEvent


C
Period End2020-11-142020-11-132020-10-30
Value19515243
Percentage of CARESActOf2020SecuredLoansAmount100.0100.0100.0

mesa:CapitalizedDebtIssuanceCostsNet us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement

mesa:CapitalizedDebtIssuanceCostsNet

mesa:FortyThreeMillionTreasuryLoan, mesa:LoanAgreement


Capitalized
Period End2020-10-30
Value700000.0
Percentage of CapitalizedDebtIssuanceCostsNet100.0

mesa:HundredAndFiftyTwoMillionTreasuryLoan, mesa:LoanAgreement


Capitalized
Period End2020-11-13
Value2300000.0
Percentage of CapitalizedDebtIssuanceCostsNet0.0

mesa:DebtInstrumentAdditionalAmountBorrowed us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:DebtInstrument, us-gaap:TypeOfArrangement

mesa:DebtInstrumentAdditionalAmountBorrowed

mesa:HundredAndFiftyTwoMillionTreasuryLoan, mesa:SecuredTermLoanFacility, mesa:LoanAgreement


Debt
Period End2020-11-13
Value152
Percentage of DebtInstrumentAdditionalAmountBorrowed100.0

mesa:DebtInstrumentAdditionalAmountBorrowed us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

mesa:SecuredTermLoanFacility, us-gaap:SubsequentEvent, mesa:LoanAgreement


Debt
Period End2020-11-13
Value152
Percentage of DebtInstrumentAdditionalAmountBorrowed100.0

mesa:DebtInstrumentAdditionalAmountBorrowed us-gaap:DebtInstrument, us-gaap:TypeOfArrangement

mesa:SecuredTermLoanFacility, mesa:LoanAgreement


Debt
Period End2020-11-13
Value152
Percentage of DebtInstrumentAdditionalAmountBorrowed100.0

mesa:DebtInstrumentAdditionalAmountBorrowed us-gaap:TypeOfArrangement

mesa:LoanAgreement


Debt
Period End2020-11-13
Value152
Percentage of DebtInstrumentAdditionalAmountBorrowed100.0

mesa:DebtInstrumentAmountBorrowed us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:DebtInstrument, us-gaap:TypeOfArrangement

mesa:DebtInstrumentAmountBorrowed

mesa:FortyThreeMillionTreasuryLoan, mesa:SecuredTermLoanFacility, mesa:LoanAgreement


Debt
Period End2020-10-30
Value43
Percentage of DebtInstrumentAmountBorrowed100.0

mesa:DebtInstrumentAmountBorrowed us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

mesa:SecuredTermLoanFacility, us-gaap:SubsequentEvent, mesa:LoanAgreement


Debt
Period End2020-10-30
Value43
Percentage of DebtInstrumentAmountBorrowed100.0

mesa:DebtInstrumentAmountBorrowed us-gaap:DebtInstrument, us-gaap:TypeOfArrangement

mesa:SecuredTermLoanFacility, mesa:LoanAgreement


Debt
Period End2020-10-30
Value43
Percentage of DebtInstrumentAmountBorrowed100.0

mesa:DebtInstrumentAmountBorrowed us-gaap:TypeOfArrangement

mesa:LoanAgreement


Debt
Period End2020-10-30
Value43
Percentage of DebtInstrumentAmountBorrowed100.0

mesa:DeferredCreditsNoncurrent

mesa:DeferredCreditsNoncurrent


Deferred
Period End2020-12-312020-09-302020-06-302019-09-30
Value5.1765.7059.35512
Percentage of DeferredCreditsNoncurrent100.0100.0100.0100.0

mesa:DeferredTaxAssetsOperatingLease

mesa:DeferredTaxAssetsOperatingLease


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value244.9286.39913
Percentage of DeferredTaxAssetsOperatingLease100.0100.0100.0100.0

mesa:DeferredTaxAssetsPrepaidAndOther

mesa:DeferredTaxAssetsPrepaidAndOther


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value1632000.02576000.03530000.08936000.0
Percentage of DeferredTaxAssetsPrepaidAndOther100.0100.0100.0100.0

mesa:DeferredTaxLiabilitiesRightOfUseAssetsLease

mesa:DeferredTaxLiabilitiesRightOfUseAssetsLease


Deferred
Period End2020-09-30
Value19
Percentage of DeferredTaxLiabilitiesRightOfUseAssetsLease100.0

mesa:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

mesa:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour


Lessee
Period End2020-12-31
Value160000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour100.0

mesa:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFour

mesa:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFour


Long
Period End2020-12-31
Value343
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFour100.0

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent


Accrual
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value12119.0355.707119.1867.6675.4157.2726.9815.6716.484
Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedVacationCurrent

us-gaap:AccruedVacationCurrent


Accrued
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value6143000.05975000.05767000.05538000.06149000.06128000.05894000.05596000.05557000.05470000.05155000.02663000.0
Percentage of AccruedVacationCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AirlineRelatedInventory

us-gaap:AirlineRelatedInventory


Airline
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value272726262625232220181817
Percentage of AirlineRelatedInventory100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AirlineRelatedInventoryNet

us-gaap:AirlineRelatedInventoryNet


Airline
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value222222222221201917151515
Percentage of AirlineRelatedInventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AirlineRelatedInventoryValuationReserves

us-gaap:AirlineRelatedInventoryValuationReserves


Airline
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value4587000.04460000.03950000.04149000.04055000.03999000.03689000.03573000.03428000.03249000.02971000.02693000.0
Percentage of AirlineRelatedInventoryValuationReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivable


Allowance
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value900000.0800000.05400000.02800000.01800000.01000000.01200000.01400000.01300000.01300000.01700000.0700000.0
Percentage of AllowanceForDoubtfulAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalLeasesBalanceSheetAssetsByMajorClassNet

us-gaap:CapitalLeasesBalanceSheetAssetsByMajorClassNet


Capital
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value1.8511.8992.121134.8722.1671.9776.9161.8382.5984.6181.945
Percentage of CapitalLeasesBalanceSheetAssetsByMajorClassNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 us-gaap:TypeOfArrangement

us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1

mesa:LoanAgreement


Class
Period End2020-10-30
Value3.98
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1100.0

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerAssetNet


Contract
Period End2020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302017-09-30
Value1600000.02000000.02400000.02800000.03900000.04500000.05000000.04100000.04600000.06100000.0
Percentage of ContractWithCustomerAssetNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiability


Contract
Period End2020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302017-09-30
Value7.78.59.410121314141517
Percentage of ContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value746743777802821858
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:AircraftType, us-gaap:DebtInstrument

srt:CRJ900, mesa:SeniorAndSubordinatedNotesPayableToSecuredPartiesCollateralizedByUnderlyingAircraftDueTwoThousandTwentyTwo


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value2934384347
Percentage of DebtInstrumentCarryingAmount4.04.44.95.25.5

us-gaap:DebtInstrumentCarryingAmount us-gaap:CreditFacility

us-gaap:RevolvingCreditFacility


Debt
Period End2020-12-312020-09-30
Value2222
Percentage of DebtInstrumentCarryingAmount3.03.1

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument

mesa:NotesPayableToFinancialInstitutionCollateralizedByTheUnderlyingEquipmentDueTwoThousandTwentyFour


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value586367717680
Percentage of DebtInstrumentCarryingAmount7.98.58.79.09.39.3

mesa:NotesPayableToFinancialInstitutionCollateralizedByUnderlyingAircraftDueTwoThousandTwentyFour


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value5555555760
Percentage of DebtInstrumentCarryingAmount7.57.26.97.07.1

mesa:NotesPayableToFinancialInstitutionCollateralizedByUnderlyingAircraftDueTwoThousandTwentyThree


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value434852566165
Percentage of DebtInstrumentCarryingAmount5.96.56.77.17.57.6

mesa:NotesPayableToFinancialInstitutionCollateralizedByUnderlyingAircraftDueTwoThousandTwentyTwo


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value4141414549
Percentage of DebtInstrumentCarryingAmount5.65.35.25.55.8

mesa:NotesPayableToFinancialInstitutionCollateralizedByUnderlyingEquipmentDueTwoThousandTwentyThree


Debt
Period End2020-09-302020-06-302019-09-30
Value6.06.58.0
Percentage of DebtInstrumentCarryingAmount0.80.80.9

mesa:NotesPayableToFinancialInstitutionDueTwoThousandTwenty


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value1.5231.5231.5231.8222.329
Percentage of DebtInstrumentCarryingAmount0.20.20.20.20.3

mesa:NotesPayableToFinancialInstitutionDueTwoThousandTwentyFive


Debt
Period End2020-12-31
Value195
Percentage of DebtInstrumentCarryingAmount26.2

mesa:NotesPayableToFinancialInstitutionDueTwoThousandTwentyThree


Debt
Period End2020-12-312020-09-302020-03-312019-12-312019-09-30
Value5.56.07.07.5038.0
Percentage of DebtInstrumentCarryingAmount0.70.80.90.90.9

mesa:NotesPayableToSecuredPartiesCollateralizedByUnderlyingAircraftDueTwoThousandTwentyEight


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value172172181181191191
Percentage of DebtInstrumentCarryingAmount23.123.223.422.723.322.3

mesa:OtherObligationsDueToFinancialInstitutionCollateralizedByUnderlyingEquipmentDueTwoThousandTwentyThree


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value6.1856.8647.1967.9048.1628.53
Percentage of DebtInstrumentCarryingAmount0.80.90.91.01.01.0

mesa:SeniorAndSubordinatedNotesPayableToSecuredPartiesCollateralizedByUnderlyingAircraftDueTwoThousandTwentyEight


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value134138141145149152
Percentage of DebtInstrumentCarryingAmount18.018.618.218.218.217.8

mesa:SeniorAndSubordinatedNotesPayableToSecuredPartiesCollateralizedByUnderlyingAircraftDueTwoThousandTwentySeven


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value105105105105107110
Percentage of DebtInstrumentCarryingAmount14.214.213.613.213.112.9

mesa:SeniorAndSubordinatedNotesPayableToSecuredPartiesCollateralizedByUnderlyingAircraftDueTwoThousandTwentyTwo


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value4753596571
Percentage of DebtInstrumentCarryingAmount6.46.97.58.08.4

mesa:WorkingCapitalDrawLoanUsedToCoverOperationalNeeds


Debt
Period End2020-09-302020-06-302020-03-31
Value222323
Percentage of DebtInstrumentCarryingAmount3.13.02.9

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument, us-gaap:PropertyPlantAndEquipmentByType

mesa:NotesPayableToFinancialInstitutionCollateralizedByUnderlyingEquipmentDueTwoThousandTwenty, mesa:FlightEquipmentMaintenance


Debt
Period End2020-09-302020-03-312019-12-312019-09-30
Value4.1824.1825.3586.962
Percentage of DebtInstrumentCarryingAmount0.60.50.70.8

us-gaap:DebtInstrumentFairValue

us-gaap:DebtInstrumentFairValue


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value777768857815846882
Percentage of DebtInstrumentFairValue100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentUnamortizedDiscount us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement

us-gaap:DebtInstrumentUnamortizedDiscount

mesa:EDCLoans, mesa:LoanAgreement


Debt
Period End2020-11-13
Value2500000.0
Percentage of DebtInstrumentUnamortizedDiscount100.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value1111141414-14.822-15.561-13.8711414-15.679-12.578
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:TypeOfArrangement

us-gaap:DeferredFinanceCostsNet

mesa:EDCLoans, mesa:LoanAgreement


Deferred
Period End2020-11-13
Value3100000.0
Percentage of DeferredFinanceCostsNet100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value205172145190
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0

us-gaap:DeferredOfferingCosts

us-gaap:DeferredOfferingCosts


Deferred
Period End2020-12-312020-09-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value1129000.01261000.01514000.01664000.02092000.02090000.02242000.01925000.01945000.03992000.01863000.0
Percentage of DeferredOfferingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredRevenue

us-gaap:DeferredRevenue


Deferred
Period End2020-09-30
Value23
Percentage of DeferredRevenue100.0

us-gaap:DeferredRevenueCurrent

us-gaap:DeferredRevenueCurrent


Deferred
Period End2020-12-312020-09-302020-06-302019-09-30
Value519.3893.761.513
Percentage of DeferredRevenueCurrent100.0100.0100.0100.0

us-gaap:DeferredRevenueCurrent us-gaap:BalanceSheetLocation

mesa:OtherAccruedExpenses


Deferred
Period End2020-09-302020-06-30
Value9.43.8
Percentage of DeferredRevenueCurrent100.1101.1

us-gaap:DeferredRevenueNoncurrent

us-gaap:DeferredRevenueNoncurrent


Deferred
Period End2020-12-312020-09-302020-06-30
Value261412
Percentage of DeferredRevenueNoncurrent100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value144119107136
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value11310691103
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration

us-gaap:DomesticCountry


Deferred
Period End2020-09-30
Value94
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal


Deferred
Period End2020-09-30
Value3100000.0
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration us-gaap:IncomeTaxAuthority, us-gaap:TaxPeriod

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration

us-gaap:DomesticCountry, mesa:PeriodOne


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value512478415299
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration100.0100.0100.0100.0

us-gaap:StateAndLocalJurisdiction, mesa:PeriodTwo


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value223228199172
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration43.747.748.157.5

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value1485000.01882000.02443000.04389000.0
Percentage of DeferredTaxAssetsTaxCreditCarryforwards100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value1000.01000.01000.02536000.0
Percentage of DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseOther


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value2842000.02329000.01871000.01756000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseOther100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value641000.0947000.0836000.01335000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value1830000.02204000.02613000.04317000.0
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-09-302019-09-302018-09-302017-09-30
Value184170143186
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0

us-gaap:DepositLiabilitiesAccruedInterest

us-gaap:DepositLiabilitiesAccruedInterest


Deposit
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value5149000.03268000.05941000.04488000.06715000.04497000.07729000.04922000.07742000.06118000.07181000.04036000.0
Percentage of DepositLiabilitiesAccruedInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value7.029121012101114119.9212239.08
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions


Employee
Period End2020-12-312020-09-30
Value4200000.05100000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value363535353434333332323232
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2020-12-312020-09-30
Value1000000.01200000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear


Finite
Period End2020-12-31
Value900000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-09-30
Value700000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2020-12-312020-09-30
Value700000.0800000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2020-12-312020-09-30
Value800000.0900000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2020-12-312020-09-30
Value900000.01000000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-312020-09-30
Value3347
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2020-12-31
Value38
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

mesa:SecuredTermLoanFacility, us-gaap:SubsequentEvent, mesa:LoanAgreement


Line
Period End2020-10-30
Value200
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:DebtInstrument, us-gaap:TypeOfArrangement

mesa:SecuredTermLoanFacility, mesa:LoanAgreement


Line
Period End2020-10-30
Value200
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-09-30
Value99189176168166165163147149155140
Percentage of LongTermDebtAndCapitalLeaseObligationsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive


Long
Period End2020-09-30
Value147
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-312020-09-30
Value113189
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


Long
Period End2020-09-30
Value56
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-312020-09-30
Value5671
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


Long
Period End2020-12-312020-09-30
Value61126
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2020-12-312020-09-30
Value89152
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear


Long
Period End2020-12-31
Value82
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear100.0

us-gaap:LongTermDebtPercentageBearingVariableInterestRate us-gaap:AircraftType, us-gaap:DebtInstrument

us-gaap:LongTermDebtPercentageBearingVariableInterestRate

srt:CRJ900, mesa:SeniorNotesDueTwoThousandTwentySeven


Long
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2.860.02870.0370.04620.04730.050980.052050.052130.049710.04802
Percentage of LongTermDebtPercentageBearingVariableInterestRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:CRJ900, mesa:SeniorNotesDueTwoThousandTwentyTwo


Long
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3.730.0380.04950.05260.05590.058320.0610.063080.058980.05592
Percentage of LongTermDebtPercentageBearingVariableInterestRate130.4132.4133.8113.9118.2114.4117.2121.0118.6116.5

srt:CRJ900, mesa:SubordinatedNotesDuetwothousandtwentytwo


Long
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4.730.0480.05950.06260.06590.068320.0710.073080.068980.06592
Percentage of LongTermDebtPercentageBearingVariableInterestRate165.4167.2160.8135.5139.3134.0136.4140.2138.8137.3

us-gaap:LongTermDebtPercentageBearingVariableInterestRate us-gaap:DebtInstrument, us-gaap:PropertyPlantAndEquipmentByType

mesa:NotesPayableToFinancialInstitutionDueTwoThousandTwenty, mesa:FlightEquipmentMaintenance


Long
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value3.30.03370.04520.04980.05160.054020.05670.05878
Percentage of LongTermDebtPercentageBearingVariableInterestRate115.4117.4122.2107.8109.1106.0108.9112.8

us-gaap:MinorityInterestOwnershipPercentageByParent us-gaap:Ownership

us-gaap:MinorityInterestOwnershipPercentageByParent

mesa:AmericanAirlinesInc


Minority
Period End2020-09-302019-09-302019-06-302019-03-312018-12-312018-09-30
Value00.0710.0720.0720.0720.072
Percentage of MinorityInterestOwnershipPercentageByParent0.0100.0100.0100.0100.0100.0

us-gaap:NotesAndLoansPayableCurrent

us-gaap:NotesAndLoansPayableCurrent


Notes
Period End2020-12-312020-09-30
Value1111
Percentage of NotesAndLoansPayableCurrent100.0100.0

us-gaap:OperatingLossCarryforwardsValuationAllowance

us-gaap:OperatingLossCarryforwardsValuationAllowance


Operating
Period End2020-09-302019-09-302018-09-302017-09-30
Value3100000.01900000.01900000.02600000.0
Percentage of OperatingLossCarryforwardsValuationAllowance100.0100.0100.0100.0

us-gaap:OtherSundryLiabilitiesCurrent

us-gaap:OtherSundryLiabilitiesCurrent


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value1324138.77.3967.564118.9328.9879.6759.2368.269
Percentage of OtherSundryLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PurchaseObligation us-gaap:ProductOrService, us-gaap:TypeOfArrangement

us-gaap:PurchaseObligation

mesa:CF348C5Engine, mesa:LetterAgreementNumberThirteenDashOne


Purchase
Period End2020-12-31
Value118
Percentage of PurchaseObligation100.0

us-gaap:RestrictedCash

us-gaap:RestrictedCash


Restricted
Period End2020-09-302019-09-302018-09-302018-06-302017-09-30
Value3400000.03600000.03823000.03823000.03559000.0
Percentage of RestrictedCash100.0100.0100.0100.0100.0

us-gaap:RestrictedCashCurrent

us-gaap:RestrictedCashCurrent


Restricted
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-30
Value3634000.03446000.03444000.03441000.03448000.03646000.03647000.03646000.03644000.03823000.03828000.03559000.0
Percentage of RestrictedCashCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueRemainingPerformanceObligation

us-gaap:RevenueRemainingPerformanceObligation


Revenue
Period End2020-12-312020-09-302020-06-30
Value488.1777.397
Percentage of RevenueRemainingPerformanceObligation100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock


Share
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-09-30
Value5.485.476.018.659.469.569.298.99.569.595.455.22
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType, us-gaap:PlanName

us-gaap:RestrictedStock, mesa:TwoThousandAndEighteenEquityIncentivePlan


Share
Period End2020-09-302019-09-302018-09-302017-09-302016-09-30
Value5.479.569.5900
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.00.00.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2020-09-302019-09-302018-09-302017-09-302016-09-30
Value4900000.04700000.04700000.07500000.07500000.0
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components