AAR CORP. is a prominent independent global provider of aerospace and defense aftermarket solutions, specializing in aviation maintenance, repair, and overhaul (MRO) services. Founded in 1955 and headquartered in Wood Dale, Illinois, AAR operates in over 20 countries, employing approximately 5,600 to 6,000 people. The company generated revenue of about $2.3 billion to $2.78 billion in fiscal 2024. AAR offers a range of services through four main business segments. These include parts supply, where they sell and lease aircraft components; repair, engineering, and software services that enhance operational efficiency; government solutions providing logistics and mobility products for military and humanitarian needs; and integrated solutions for managing fleet operations. AAR serves a diverse clientele, including commercial airlines, OEMs, government agencies, and NGOs, establishing itself as a leading MRO provider in North America.