Light Flyer Bonus Jet:
Successfully complete the game with the normal ending. Note: Use Limit 500 or Unlimited modes.

Leo Copter Bonus Jet:
Successfully complete the game with the good ending. Note: Use Unlimited, Mirror, or Reverse modes.

Foo Fighter Bonus Jet:
Successfully complete the game with the Light Flyer & Leo Copter Bonus Jets. Note: Use Unlimited, Mirror, or Reverse modes.

The Fly Bonus Jet:
Successfully complete the game with the Foo Fighter Bonus Jet. Note: Use Unlimited, Mirror, or Reverse modes & destroy all the balloons in the bonus level.