Blue Lightning Cheats

Activate the afterburners as you enter the canyons on level 4 to
receive a "Gutsy" bonus of 30,000 points. Activate the afterburners
again immediately before entering the second set of canyons to
receive a "Lunatic" bonus of 65,000 points. The bonus points are
added to your score after landing.

In Level 6, do a barrel-roll (Pressing Option 2 and turn left or right), then hold the plane upside-down, while pressing Up over an airstrip to land. You will then land upside-down, the cockpit opens from the fuel tank, and you take off backwards.