Aircraft:
On all levels that contain multiple aircraft bogies, the best solution is to wipe out all aircraft by flying low to the ground, then pulling up on the stick to get a missile lock to destroy them. Take one bogie out at a time, then fly back close to the ground and start the process all over again.

Anti-aircraft Guns:
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.

Destroy Tanks, Vans And Most Moving Ground Targets:
Use the afterburners when you are close to the ground. This will not work on BTROs or gunboats (it will just do damage).

Flying:
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.

Turning:
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.