Press T to display the message prompt, then activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
Unlimited ammunition - you got what i need
Reload weapons - food goes here
Refuel - big gulp
Invincibility - youre here forever
Disable crashes - damn that corner
Repair damage - chiliburger
Plane cannot be hit - spindive
Auto level. fly upside down - upside down
Paper airplane - paperairplane
Display throttle - show throttle
Display speed in mach units - show mach
Display air speed - show velocity
Display ground speed - show ground speed
Display fuel usage - show fuel
Display fuel usage as % - show fuel usage
Display altitude in feet - show altitude
Display angle of attack - show aoa
Toggle blackouts - blackout
Toggle flameouts - flameout
Toggle flatspins - flatspin
"Yes he does" message - patsux