In the indicated difficulty setting and campaign complete the following missions to unlock the corresponding plane in the game. Japanese planes cannot be used in Campaign or Mission mode until Campaign mode has been completed at least once.
When you are palying 2 player split screen, make the other player's health go down to a bare minimum.(ive only tried this in iwo jima with a marauder and a p-51D mustang-mustang kill marauder) anyway after that go out of bounds (marauder) and p-51d mustamg stay in bounds and kill the marauder. If it works the marauder will stop while flying and you can still shoot and sometimes move. Finally you will crash but it's hard to control. Have Fun!!!
Cheat Menu, Unlock Japanese Planes,Unlock Planes and Missions, aAdded 21 Dec 2005, ID #18750
At the main menu,enter the following codes to unlock the corresponding cheats. If you entered the code correctly, you'll see a message confirming the code on the screen. CHEAT MENU: Press L1,R2,L2,R3,R1L3 UNLOCK JAPANESE PLANES: Press Circle,R2,L1,L2,Left,Up UNLOCK PLANES AND MISSIONS: Press Up on Right Analog Stick, Down on Right Analog Stick, Left on Right Analog Stick, R2,L1,Right on Right Analog Stick. UPGRADE PLANES: Press L1,Left on Right Analog Stick,R2,Right on Right Analog Stick,Right,Down.