Air Transport Services Group, Inc., through its subsidiaries, provides airline operations, aircraft leasing and maintenance, and other support services primarily to the air cargo transportation and package delivery industries in the United States and internationally. The company leases cargo aircraft to airlines and other customers; and offers medium range and medium capacity airlift services. It also provides airline operations to airlines, freight forwarders, and the U.S. Military, as well as operates charter agreements. In addition, the company offers support services comprising flight crew training, flight simulator rental, and aircraft line maintenance services; aircraft maintenance, repair, and overhaul services, as well as insurance; resale and brokerage of aircraft parts; material handling and ground equipment maintenance, and ground equipment rentals for aircraft support; and aircraft dispatch and flight tracking service, as well as operates mail sorting centers for the U.S Postal Service. As of December 31, 2014, the company operated a fleet of 56 aircraft, including 53 owned and 3 leased aircraft. The company was formerly known as ABX Holdings, Inc. The company was founded in 1980 and is headquartered in Wilmington, Ohio.