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<?xml version="1.0" encoding="windows-1252"?> |
<ownershipDocument> |
| <schemaVersion> X0306 </schemaVersion> |
| <documentType> 4 </documentType> |
| <periodOfReport> 2020-08-31 </periodOfReport> |
| <notSubjectToSection16> 0 </notSubjectToSection16> |
| <issuer> |
| | <issuerCik> 0000001750 </issuerCik> |
| | <issuerName> AAR CORP </issuerName> |
| | <issuerTradingSymbol> AIR </issuerTradingSymbol> |
| | </issuer> |
| <reportingOwner> |
| | <reportingOwnerId> |
| | | <rptOwnerCik> 0001212698 </rptOwnerCik> |
| | | <rptOwnerName> WALFISH MARC JAY </rptOwnerName> |
| | | </reportingOwnerId> |
| | <reportingOwnerAddress> |
| | | <rptOwnerStreet1> 1100 N. WOOD DALE ROAD </rptOwnerStreet1> |
| | | <rptOwnerStreet2></rptOwnerStreet2> |
| | | <rptOwnerCity> WOOD DALE </rptOwnerCity> |
| | | <rptOwnerState> IL </rptOwnerState> |
| | | <rptOwnerZipCode> 60191 </rptOwnerZipCode> |
| | | <rptOwnerStateDescription></rptOwnerStateDescription> |
| | | </reportingOwnerAddress> |
| | <reportingOwnerRelationship> |
| | | <isDirector> 1 </isDirector> |
| | | <isOfficer> 0 </isOfficer> |
| | | <isTenPercentOwner> 0 </isTenPercentOwner> |
| | | <isOther> 0 </isOther> |
| | | </reportingOwnerRelationship> |
| | </reportingOwner> |
| <derivativeTable> |
| | <derivativeTransaction> |
| | | <securityTitle> |
| <value> Phantom Stock </value> |
| </securityTitle> |
| | | <conversionOrExercisePrice> |
| <value> 20.18 </value> |
| </conversionOrExercisePrice> |
| | | <transactionDate> |
| <value> 2020-08-31 </value> |
| </transactionDate> |
| | | <transactionCoding> |
| <transactionFormType> 4 </transactionFormType> |
| <transactionCode> A </transactionCode> |
| <equitySwapInvolved> 0 </equitySwapInvolved> |
| </transactionCoding> |
| | | <transactionTimeliness> |
| <value></value> |
| </transactionTimeliness> |
| | | <transactionAmounts> |
| <transactionShares> |
| <value> 646 </value> |
| <footnoteId id="F1"/> |
| </transactionShares> |
| <transactionPricePerShare> |
| <value> 20.18 </value> |
| </transactionPricePerShare> |
| <transactionAcquiredDisposedCode> |
| <value> A </value> |
| </transactionAcquiredDisposedCode> |
| </transactionAmounts> |
| | | <exerciseDate> |
| <value> 2020-08-31 </value> |
| </exerciseDate> |
| | | <expirationDate> |
| <value> 2024-09-30 </value> |
| <footnoteId id="F2"/> |
| </expirationDate> |
| | | <underlyingSecurity> |
| <underlyingSecurityTitle> |
| <value> Common Stock </value> |
| </underlyingSecurityTitle> |
| <underlyingSecurityShares> |
| <value> 646 </value> |
| </underlyingSecurityShares> |
| </underlyingSecurity> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 646 </value> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| </ownershipNature> |
| | | </derivativeTransaction> |
| | </derivativeTable> |
| <footnotes> |
| | <footnote id="F1"> Phantom Stock 646 shares - This amount includes 496 shares at $20.18 per share of the deferred quarterly director's retainer fee and 150 shares for the quarterly dividend equivalent shares acquired as dividend reinvestment on deferred compensation, pursuant to the reinvestment feature of the Non-Employee Directors' Deferred Compensation Plan. </footnote> |
| | <footnote id="F2"> Phantom stock units are payable in stock on a 1-for-1 basis or cash at the grantee's election upon retirement/termination as a director. </footnote> |
| | </footnotes> |
| <ownerSignature> |
| | <signatureName> /s/ Kai England, Power of Attorney </signatureName> |
| | <signatureDate> 2020-09-01 </signatureDate> |
| | </ownerSignature> |
| </ownershipDocument> |