Bonus points
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.
Level Password
1 ...... AAAA
2 ...... PLAN
3 ...... ALFA
4 ...... BELL
5 ...... NINE
6 ...... LOCK
7 ...... HAND
8 ...... FLEA
9 ...... LIFE
Landing upside down
Upside down landings are allowed on level 6. Pressing Option 2 + Left or Right to perform a barrel-roll. Keep the plane upside-down and press Up while over an airstrip to land. After landing, the cockpit will open from the fuel tank and you may take off again by flying backwards.