Press <T> for a message prompt and type these below.
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big gulp : Refuel your Plane
chiliburger : Full Repair
damn that corner : You can't crash
food goes here : Reload your Plane
paperairplane : Paper Airplane
patsux : ???
spindive : Invincibility
upside down : Auto level fly upside down
you got what i need : Unlimited Ammo
youre here forever : God Mode