Previously known as Hughes More recently known as Boeing MD Helicopters McDonnell Douglas history 1946- (1984 ex hughes) -1997. For Company history see Timeline List of McDonnell Douglas models Model / Versions 1982 YAH-64 AH-64A Apache 1984 369 / 500 / H-6 md500 MH-6E 1984 MD369E / MD500E 1984 MD369F / MD500F 1991 TH-6B Cayuse 1988 md500 MD520N 1992 MD900 Explorer 1997 MD902 Explorer Branches mcdonnell douglas