Cheat mode:
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Pause your game and press A, B, A, B, Select, A, B
on controller two for full fuel and more missiles.

Super A-10:
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Select the A-10 and begin game play. Shoot the 30mm
cannon one time and hold X when the phrase "Good Luck"
appears. Continue holding the button until the phrase
"Super A-10" appears in the lower left corner of the
screen.