Here are some cheats and tips for the game Air Diver.
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.