I think the original MS Flight Simulator was essentially a licensed version of subLOGIC Flight Simulator. Side note: subLOGIC also made another combat-oriented

I think the original MS Flight Simulator was essentially a licensed version of subLOGIC Flight Simulator. Side note: subLOGIC also made another combat-oriented one around that same time called Jet which I think used the same engine as MS FS and subLOGIC FS because all of them could use the same scenery disks as I recall...