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Hold down the ALT button and go into 'Reference'.
Keep holding it down. Click on the ghosted out 'Fly'
button and you can fly any plane you wish.
Cheat:
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While in the main menu hang on to the right:
Ctrl, Alt, Shift then enter the plane preview
section when you come to the plane that says
"Atomic Moth"
let go you can now go to free flight and you
are in a moth. Your weapon, mothballs.
