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  <xs:element id="wlfc_WestIISeriesANotesMember" abstract="true" name="WestIISeriesANotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodAggregateGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodAggregateGrantDateFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_WESTIVNotesMember" abstract="true" name="WESTIVNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPercentageOfCashCompensationAllowedToBeDeductedForPurchaseOfCommonStockByEligibleEmployees" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPercentageOfCashCompensationAllowedToBeDeductedForPurchaseOfCommonStockByEligibleEmployees" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wlfc_EquipmentHeldForOperatingLeaseMaturingInYear2Member" abstract="true" name="EquipmentHeldForOperatingLeaseMaturingInYear2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_WESTVNotesMember" abstract="true" name="WESTVNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_WESTIIINotesWESTIVNotesAndWESTVNotesMember" abstract="true" name="WESTIIINotesWESTIVNotesAndWESTVNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_ManagedServicesAndOtherRevenueMember" abstract="true" name="ManagedServicesAndOtherRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_AmortizationOfLeaseAcquisitionCosts" abstract="false" name="AmortizationOfLeaseAcquisitionCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_CSCWillisEngineLeaseCompanyLimitedMember" abstract="true" name="CSCWillisEngineLeaseCompanyLimitedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxJointVenture" abstract="false" name="OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxJointVenture" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_NumberOfGeographicRegionsInWhichAircraftLesseesAreDomiciledIn" abstract="false" name="NumberOfGeographicRegionsInWhichAircraftLesseesAreDomiciledIn" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="wlfc_EquipmentHeldForOperatingLeaseMaturingInYear4Member" abstract="true" name="EquipmentHeldForOperatingLeaseMaturingInYear4Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_NotesPayableDueJuly2022Member" abstract="true" name="NotesPayableDueJuly2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_ContingenciesRelatedToCOVID19Member" abstract="true" name="ContingenciesRelatedToCOVID19Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_WESTIIISeriesBNotesMember" abstract="true" name="WESTIIISeriesBNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_EquityMethodInvestmentSummarizedFinancialInformationTableTextBlock" abstract="false" name="EquityMethodInvestmentSummarizedFinancialInformationTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wlfc_EquipmentHeldForOperatingLeaseMaturingInNextTwelveMonthsMember" abstract="true" name="EquipmentHeldForOperatingLeaseMaturingInNextTwelveMonthsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_MikchalkLakeLlcMember" abstract="true" name="MikchalkLakeLlcMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_WESTVSeriesBNotesMember" abstract="true" name="WESTVSeriesBNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_ReductionToRevenueRentConcessions" abstract="false" name="ReductionToRevenueRentConcessions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesAndAllowances" abstract="false" name="DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesAndAllowances" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAggregateGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAggregateGrantDateFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_EquipmentHeldForOperatingLeaseMaturingInYear3Member" abstract="true" name="EquipmentHeldForOperatingLeaseMaturingInYear3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_WillisEngineStructuredTrustVMember" abstract="true" name="WillisEngineStructuredTrustVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_NumberOfAssetsImpaired" abstract="false" name="NumberOfAssetsImpaired" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="wlfc_EquityMethodInvestmentBalancesRollForward" abstract="true" name="EquityMethodInvestmentBalancesRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wlfc_NumberOfAssetsUsedToSecureDebt" abstract="false" name="NumberOfAssetsUsedToSecureDebt" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="wlfc_IncomeTaxReconciliationPermanentDifferencesRelatingToIRSSection162m" abstract="false" name="IncomeTaxReconciliationPermanentDifferencesRelatingToIRSSection162m" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_AnnualInsurancePremium" abstract="false" name="AnnualInsurancePremium" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_WESTVSeriesANotesMember" abstract="true" name="WESTVSeriesANotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_GainLossOnEquipmentHeldForSale" abstract="false" name="GainLossOnEquipmentHeldForSale" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_RelatedPartyTransactionAggregateLeasePaymentMadeToRelatedParty" abstract="false" name="RelatedPartyTransactionAggregateLeasePaymentMadeToRelatedParty" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_DerivativeInstrumentsBenefitRecordedToNetFinanceCosts" abstract="false" name="DerivativeInstrumentsBenefitRecordedToNetFinanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_OrganizationsLineItems" abstract="true" name="OrganizationsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wlfc_ProjectedMaintenanceObligationPeriodForSecurityDeposit" abstract="false" name="ProjectedMaintenanceObligationPeriodForSecurityDeposit" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="wlfc_TransfersFromEquipmentHeldForOperatingLeaseToSparePartsInventory" abstract="false" name="TransfersFromEquipmentHeldForOperatingLeaseToSparePartsInventory" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_WillisEngineSecuritizationTrustIIMember" abstract="true" name="WillisEngineSecuritizationTrustIIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_The2018StockIncentivePlanMember" abstract="true" name="The2018StockIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_BasisOfAccountingAndPrinciplesOfConsolidationPolicyPolicyTextBlock" abstract="false" name="BasisOfAccountingAndPrinciplesOfConsolidationPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wlfc_PreferredStockPurchasePricePerShare" abstract="false" name="PreferredStockPurchasePricePerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wlfc_LessorOperatingLeaseCarryingValueOfAssetsSubjectToLeasesTableTextBlock" abstract="false" name="LessorOperatingLeaseCarryingValueOfAssetsSubjectToLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wlfc_MarineVesselsMember" abstract="true" name="MarineVesselsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_NumberOfLeasedAssets" abstract="false" name="NumberOfLeasedAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="wlfc_SparePartsAndEquipmentSalesMember" abstract="true" name="SparePartsAndEquipmentSalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_Class2012ATermNotesMember" abstract="true" name="Class2012ATermNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_SparePartPackagesMember" abstract="true" name="SparePartPackagesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_OneCustomerMember" abstract="true" name="OneCustomerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_AccumulatedOtherComprehensiveIncomeLossTax" abstract="false" name="AccumulatedOtherComprehensiveIncomeLossTax" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_SeriesOnePreferredStockMember" abstract="true" name="SeriesOnePreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_EmployeeStockPurchasePlanMember" abstract="true" name="EmployeeStockPurchasePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_NumberOfEngines" abstract="false" name="NumberOfEngines" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="wlfc_NumberofAssetsSold" abstract="false" name="NumberofAssetsSold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="wlfc_IncentiveAwardPlan2007Member" abstract="true" name="IncentiveAwardPlan2007Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_WESTIVSeriesBNotesMember" abstract="true" name="WESTIVSeriesBNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_EquipmentHeldForSale" abstract="false" name="EquipmentHeldForSale" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_EquipmentHeldForSalePolicyPolicyTextBlock" abstract="false" name="EquipmentHeldForSalePolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wlfc_IncreaseDecreaseInAssetImpairmentCharges" abstract="false" name="IncreaseDecreaseInAssetImpairmentCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_IncomeTaxReconciliationNondeductibleExpensePermanentDifferencesAndOtherAdjustments" abstract="false" name="IncomeTaxReconciliationNondeductibleExpensePermanentDifferencesAndOtherAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_SeriesTwoPreferredStockMember" abstract="true" name="SeriesTwoPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_ManagedServicesMember" abstract="true" name="ManagedServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_ScheduleOfFairValueAssetsAndGainLossesMeasuredOnNonrecurringBasisTableTextBlock" abstract="false" name="ScheduleOfFairValueAssetsAndGainLossesMeasuredOnNonrecurringBasisTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wlfc_InterestRateContract1Member" abstract="true" name="InterestRateContract1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_MinimumCashFromMaintenanceReservePaymentsRequiredToBeHeldInRestrictedCashAccount" abstract="false" name="MinimumCashFromMaintenanceReservePaymentsRequiredToBeHeldInRestrictedCashAccount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_InitialDirectCostsOfLeasesPolicyTextBlock" abstract="false" name="InitialDirectCostsOfLeasesPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wlfc_RelatedPartyTransactionProceedsFromSaleOfAssets" abstract="false" name="RelatedPartyTransactionProceedsFromSaleOfAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_LineOfCreditFacilityMaximumBorrowingCapacityBeforeAmendment" abstract="false" name="LineOfCreditFacilityMaximumBorrowingCapacityBeforeAmendment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_NetCashPaidDuringThePeriodAbstract" abstract="true" name="NetCashPaidDuringThePeriodAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wlfc_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wlfc_WESTIIISeriesANotesMember" abstract="true" name="WESTIIISeriesANotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_AssetsToBeSoldOrPartedOutMember" abstract="true" name="AssetsToBeSoldOrPartedOutMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingAggregateGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingAggregateGrantDateFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_DeferredTaxLiabilitiesNotesReceivable" abstract="false" name="DeferredTaxLiabilitiesNotesReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_WESTIVSeriesANotesMember" abstract="true" name="WESTIVSeriesANotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_DeferredTaxAssetsLeaseLiabilities" abstract="false" name="DeferredTaxAssetsLeaseLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_IncreaseDecreaseInMaintenanceReserves" abstract="false" name="IncreaseDecreaseInMaintenanceReserves" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_DefinedContributionPlanMaximumPercentageOfPreTaxSalaryThatCouldBeDeferredByParticipants" abstract="false" name="DefinedContributionPlanMaximumPercentageOfPreTaxSalaryThatCouldBeDeferredByParticipants" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wlfc_AircraftMember" abstract="true" name="AircraftMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_NetInvestmentInLeaseNotesReceivable" abstract="false" name="NetInvestmentInLeaseNotesReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_UseofMarineVesselMember" abstract="true" name="UseofMarineVesselMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_NotesPayableDueJuly2024Member" abstract="true" name="NotesPayableDueJuly2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_DefinedContributionPlanMinimumAgeOfEmployeesForSpecifiedContributionAmount" abstract="false" name="DefinedContributionPlanMinimumAgeOfEmployeesForSpecifiedContributionAmount" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="wlfc_SaleofVehicleMember" abstract="true" name="SaleofVehicleMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_InterestRateContract4Member" abstract="true" name="InterestRateContract4Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_WESTVSeriesCNotesMember" abstract="true" name="WESTVSeriesCNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_EnginesAndRelatedEquipmentMember" abstract="true" name="EnginesAndRelatedEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_OffLeaseAndOtherEquipmentMember" abstract="true" name="OffLeaseAndOtherEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_FinanceCostsNet" abstract="false" name="FinanceCostsNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_MaintenanceReserves" abstract="false" name="MaintenanceReserves" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_LeaseRentRevenueMember" abstract="true" name="LeaseRentRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_OneTimeSubscriberFee" abstract="false" name="OneTimeSubscriberFee" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_NetProceedsFromIssuanceOfRedeemableConvertiblePreferredStock" abstract="false" name="NetProceedsFromIssuanceOfRedeemableConvertiblePreferredStock" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_PercentageOfWorkforceFurloughedOrSubjectToReducedCompensation" abstract="false" name="PercentageOfWorkforceFurloughedOrSubjectToReducedCompensation" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wlfc_MaintenanceReserveRevenueMember" abstract="true" name="MaintenanceReserveRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_LeasingAndRelatedOperationsSegmentMember" abstract="true" name="LeasingAndRelatedOperationsSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_UncertainTaxPositionsReservedForForeignExposure" abstract="false" name="UncertainTaxPositionsReservedForForeignExposure" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_InterestRateContract3Member" abstract="true" name="InterestRateContract3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wlfc_OtherAssetsPolicyTextBlock" abstract="false" name="OtherAssetsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wlfc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAggregateIntrinsicValueRollForward" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAggregateIntrinsicValueRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wlfc_RelatedPartyTransactionPaymentReceivedForUseOfVessel" abstract="false" name="RelatedPartyTransactionPaymentReceivedForUseOfVessel" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wlfc_RevenueRecognitionFromCustomersAbstract" abstract="true" name="RevenueRecognitionFromCustomersAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
</xs:schema>
