Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. AAR CORP. NYSE: AIR is an aviation support company. Founded in 1951, AAR provides a broad range of products and services to the aerospace and government/defense industries, with a nearly even split between them. Engineering and manufacturing products account for approximately a third of AAR s business and aftermarket support services the remaining two-thirds. AAR is headquartered in Wood Dale, Illinois, a Chicago suburb near O'Hare International Airport and employs approximately 6,500 people in 13 countries and at more than 60 locations around the world.