Secret Weapons Over Normandy

Unlimited ammunition:
Press [Up] [Right] [Down] [Left] [Up] [Right] [Down] [Left] JL at the menu with "Continue" and "New Game" options. The phrase "Secret code accepted" will be spoken to confirm correct code entry. When you fire your weapons, the current number of rounds remaining will increase to 9999.

Invincibility:
Press [Up] [Down] [Left] [Right] [Left] [Left] [Right] [Right] JJLL [Page Up] [Page Down] at the menu with "Continue" and "New Game" options. The phrase "Secret code accepted" will be spoken to confirm correct code entry.

Big heads:
Press [Right] [Up] [Left] [Down] [Right] [Up] [Left] [Down] [Right] JLJL at the menu with "Continue" and "New Game" options. The phrase "Secret code accepted" will be spoken to confirm correct code entry.

All instant action levels:
Press [Up] [Down] [Left] [Right] JLJL at the menu with "Continue" and "New Game" options. The phrase "Secret code accepted" will be spoken to confirm correct code entry.

More instant replay views:
Press [Up] [Down] [Left] [Right] LLJJ at the menu with "Continue" and "New Game" options. The phrase "Secret code accepted" will be spoken to confirm correct code entry.

Dornier 335:
Totally complete the game (all secondary and bonus objectives in every level) to unlock the German Dornier 335. This plane has a propeller in the back and middle. It can range from 72 to 450 mph.
Dhb6.

X-Wing:
Successfully complete all campaign and challenge missions to unlock the X-Wing in Instant Action mode.
Thomas Allen.

TIE Fighter:
Successfully complete all campaign and challenge missions to unlock the TIE Fighter in Instant Action mode.