F-15 Strike Eagle IF-15 Strike Eagle I. This was my first Microprose sim. It was very arcade in it's style compared to the others that I had flown until then.
The Dam Busters sim was the first one to involve multi-tasking. You could be pilot, engineer, gunner or bomb aimer - in fact you had to do all at some point in the mission.
A.C.E. 2, the sequel to A.C.E. (Air Combat Emulator), was a two player head-head sim. You could fly either a kind of F18/F16 crossbreed or some sort of MiG, like a cross between a MiG-21 Fishbed and a Flogger.
The best head-head two player I had was Top Gun . Flying F14 against F14, using what looked like Phoenix missiles but acted like Sparrows.
Test pilot's paradise - that was Chuck Yeager's Advanced Flight Trainer Chuck Yeager's Advanced Flight Trainer.
Gunship (1987) ! The first true helicopter sim - and what a subject! The mighty AH64 Apache. This really was a first class sim from start to finish.
Spitfire '40 . This was a dream come true after my time playing Time-Gate. Flying a real Spitfire against real Germans!
NIght Raider NIght Raider was like the big brother of Dam Busters. You had to fly the Grumman Avenger torpedo bomber as a member of the British Fleet Air Arm.
Project Stealth Fighter was an absolute corker - if you were willing to wait for the thing to load. It was a BIG game by Spectrum standards, and by far the most complex.
That's my memories of the Spectrum flight sims. After that comes the Amiga and PC.