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Flight Simulator is simulation "game" in which you pilot an airplane around the world. It started off as subLOGIC Flight Simulator on the Apple II, but was OEMed by Microsoft for the IBM PC. It was very popular, and one of few early games to provide a "3d" experience.
Microsoft Space Simulator is a space flight simulator program for MS-DOS. It was one of the first general-purpose space flight simulators and it incorporated concepts from astrodynamics and celestial mechanics.