Glitch

I found a way to get ublimited flying time (in the level, not in tutorial). Fly up really high at max speed. Lower the speed as much as possible and fly down. Fire a missile at the water and aim up while accelerating. It says you died but youre still flying. Going in the water or dying normally may get you stuck. Doing this trick multiple times at once (firing more than one missile) can make the plane a sub.

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