Special options
Successfully complete all twenty missions on the normal difficulty setting to unlock a "Special" selection on the options menu. The new options allow infinite missiles and the HUD display to be removed.

Bonus airplanes
Successfully complete all twenty missions to unlock the following airplanes: Sea Harrier, AV-8B Harrier II, F/A-18C Hornet, F-15E Strike Eagle, Su-27B Flanker, Su-34 Platypus, S-37 Berkut, MiG-1.44 MFI.

Extra money
Use guns instead of missiles to shoot down an airborne target to double the reward money.

Pass through objects
Pause the game before your plane hits an object. Then, press B + Y to change camera angles. Resume the game to have your plane pass through the object.

Full replay screen
During a replay, hold X + Y to remove the text from the screen.