Cheat mode:
Enter the mission selection screen. Move the pointer over the map to a location that is not a mission area. Hold Start, press A, B, C, B, A(2), B, C, B, A, B, and release Start. A sound will confirm correct code entry. Move the pointer over a mission area and hold one of the following buttons to fight that opponent. Note: The button(s) must be held until the mission starts.

Fighter Ace
Hold A. For invincibility, hold Start + A.

Super Carrier
Hold B. For invincibility, hold Start + B.

Last Fighter
Hold C. For invincibility, hold Start + C.