Cheat mode
Enter "SHPONGLE" as a name to unlock all aircraft and levels. Note: The effects of the code will be disabled if the game is saved. -From: hybird04@yahoo.com
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.