Secret Weapons Over Normandy

Enter codes on the "campaign" screen. Then choose campaign not new game.
Unlock all levels:
Part1: k, k, k, I, I, I, esc, k
Part2: pgdown, pgdown, pgup, pgup

During gameplay, enter: UP, RIGHT, DOWN, LEFT, UP, RIGHT, DOWN, LEFT, J, L

To unlock the X-wing and Tie Fighter in Instant Action Mode, beat all 15 missions and all 22 challenge missions.