Cheat codes:

Infinite ammunition:
     Pause the game and press R1, L1, R2, L2, R1.

Invincibility:
     Pause the game and press R1, L1, R2, L2, L1.

Level select:
     Pause the game and press R1, L1, R2, L2, Start.

Unlimited fuel:
     Pause the game and press R1, L1, R2, L2, Select, R1, L1.

Repair damage:
     Return  to your base or the USS Armstrong and land to repair your
fighter  by one point. Note: This may only be done a limited number of
times