Top Gun: Combat Zones Cheats
Flying close to the ground causes the anti-aircraft guns to overshoot your plane. They cannot fire below a certain point due to the risk of hitting their own men.
For easier turning upwards if you are about to crash, use your throttle to speed up and pull up to get out faster and for bonus points.
As the missions gain in complexity, every fly over must be highly efficient. Instead of tight sweeping turns, use over-the-top turns. This can cut a 10 second turn down to 3 seconds and place you in a better attack mode to start the next run. This requires practice.