Still on my brother's Spectrum, and this was my first intro to flight simulators. It was - of course - Microprose's 'F15 Strike Eagle' and to say the graphics were basic is.....
Well, judge for yourselves!
Compare it to a modern flight sim (Hell, compare it to its sequels!) and there's just no contest, graphics-wise.
But the gameplay was pretty good, and soon made you forget that awful insistent 'brrrrrrr' noise from the rudimentary soundcard. It was tricky to play, and so very rewarding when you actually managed to shoot something!
And if you went on - as I did - to play more advanced flight sim games throughout your gaming career, it was a pretty good basic trainer.