Unlock all campaign missions and planes:
When you are at the main menu, hold L2 + R2 then quickly push Square, 
L1, R1, Triangle, Triangle, R1, L1, Square buttons on your controller 
to unlock all campaign missions and access to all planes.

Activate invincible mode:
While playing the game, push the Start button to pause game play.
Then hold L2 and quickly push Square, Triangle, Triangle, Square. 
Release L2 trigger, then hold R2 and quickly push Triangle, Square, 
Square, Triangle. Finally release R2 trigger to enable invincibility. 
Re-enter the cheat code to deactivate the cheat effect.

More damage:
While playing the game, push the Start button to pause game play. 
Then hold L2 and quickly push L1, L1, R1. Release L2 trigger, then 
hold R2 and quickly press R1, R1, L1. Release R2 trigger to increase 
the damage of the weapons. Re-enter the cheat code to deactivate 
the cheat effect.