Psion Flight Sim for the Spectrum 48K and then Digital Integration’s Tomahawk (it had mountains!) for the same - I played Tomahawk a lot more.
I had access to A10-Tank Killer in the early 90s, but the very first PC game I bought (before I purchased the PC 4 months later) was the DOS version of Flight Unilimited in '95 - played a lot of that too.
Just found the box so I thought I’d update my post for posterity
