I had the Atari version of subLOGIC Flight Simulator II as a kid, which was a port of Microsoft Flight Simulator 1.0’s improvements back to 8-bit systems from the PC, and looks quite similar.
In a bout of nostalgia I recently got a vintage Atari and tracked down a copy of FS2 for it; in addition to the detailed manual (which I remember reading about VOR navigation in!) it includes navigation maps for the scenery areas that come with it; those are really fun to compare against modern real-world maps. 
