Production of the DC-10 ended in 1989 with 386 delivered to airlines and 60 to the U.S. Air Force as air-to-air refueling tankers , designated `` KC-10 Extender '' .
Production of the DC-10 ended in December 1988 with 386 delivered to airlines and 60 to the U.S. Air Force as air-to-air refueling tankers , designated the KC-10 Extender .