EXHIBIT 21.1 SUBSIDIARIES OF AAR CORP. (1) STATE OF NAME OF CORPORATION INCORPORATION ------------------- ------------- AAR Allen Airmotive, Inc. ................. Illinois AAR Aviation Services, Inc. (2) ........... New York AAR Aviation Trading, Inc. (3) ............ Illinois AAR Financial Services Corp. .............. Illinois AAR Hardware Corp. (4) .................... Illinois AAR Manufacturing, Inc. (5) ............... Illinois AAR Oklahoma, Inc. (6) .................... Oklahoma AAR PowerBoss, Inc. (7) ................... Illinois - - ----------- (1) Subsidiaries required to be listed pursuant to Regulation S-K Item 601(b)(21). (2) Also does business under the name of AAR Engine Component Services, AAR Landing Gear Center, AAR Technical Service Center, AAR Technical Service Center - Midwest and Mars Aircraft Radio. (3) Also does business under the names AAR Aircraft Turbine Center, AAR Allen Aircraft, AAR Defense Systems and AAR Expendables. (4) Also does business under the name AAR Hardware. (5) Also does business under the names AAR Advanced Structures, AAR Cadillac Manufacturing, AAR Handling Systems, AAR Skydyne and Aeronetics. AAR Manufacturing, Inc. was formerly known as AAR Brooks & Perkins Corp. (6) Also does business under the names Warsaw Aircraft Parts and AAR Southern Star. (7) Also does business under the name AAR PowerBoss.