Cheat Menu (In-Game)
On the main menu, input Y, L-TRIGGER, LEFT, R-TRIGGER, RIGHT, WHITE.

Unlockable All Planes And Sorties
On the main menu, input UP (right stick), DOWN (rights stick), WHITE, BLACK, RIGHT (left stick), RIGHT (right stick).

Unlockable Japanese Planes
On the main menu, input WHITE, BLACK, L-TRIGGER, R-TRIGGER, UP, LEFT (on the right joystick). A message should appear. After clearing the first mission, you should have access to the Japanese A6M ZERO in the hangar.

Cheat Upgrade All Aircraft
On the main menu, input L-TRIGGER, LEFT (rigth stick), R-TRIGGER, RIGHT (right stick), WHITE, Y.