AAR is one of the world s leading aviation support companies. Through its diverse family of businesses, it provides a broad range of products and services to meet the demands of its commercial and government customers, such as aircraft engine parts supply, inventory management programs, aircraft modifications and upgrades, systems installation, and aircraft sales and leasing. AAR supports a diverse group of approximately 13,000 customers that manufacture, maintain or fly aircraft, including American Airlines, Southwest Airlines, United Airlines, Airborne Express, Boeing, General Electric and the governments of Israel, Japan and the United States. Founded in 1951, AAR is headquartered in Wood Dale, Ill., a suburb of Chicago. The company employs more than 3,500 people in 40 international facilities.