Play All Aircrafts
If you want to play with all the aircraft offered in the game simply complete the free missions. If you have not already bought them in the campaign mode. For you plane junkies some of the planes are, the Mig-1.44 MAPO, the full line of Sukhoi craft (Su-27, Su-34, etc.) Several fantasy fighters, and many you will not see in campaign mode. Give it a spin.

Extra Money
Destroy any airborn targets with your GUNS instead of missiles and you will get double the money bonus at the end.

Go 1500 MPH
Go into a hard banking turn using your rudder so that you are flying sideways in a circle. Hold both rudder triggers in while you continue to fly in circles. Your planes speed will increase to over 1500mph which is as fast as the game allows. This double rudder cheat works for about half of the planes in the game.

Destroy Ships Easily
When you are in any kind of sea battle, focus your machine gun on the orange targets on the ships. Fly low, and use your guns on the orange targets (upper deck of ship) and destroy it easily. Dont worry if the ship shoots a missile at you, because whey it blows up the missile flies off. You must fly fast though, to be effective. Rarely brake and make large swooping turns.The best fighters for the last ocean battles is either the F-22 Raptor or the Berkut because they are highly manuverable and can easily turn away from missiles.

Earn Extra Money
Within the time limit, destroy as many other targets other than your "primary" target(s). If you time it correctly, destroy as many other land/air targets as you can before going after the mission objective, thus earning more money.

Get More Planes
To get more planes, you have to beat any two levels at a time. When you have beaten two levels, you will receive money on both levels to purchase more planes.