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The Ultimate Hovering/Flying Airboat

Press Right arrow and Left arrow to steer left and right with thrusters which is handy to be able to steer at high speeds. Note: only use the steering thrusters if you're on the ground or you will just barrel roll over and over again if you're in the air.
Numpad 8 and 5 is to hover and to descend.
Numpad 1 and 0 is to thrust forward and backwards. (To fly, press Numpad 1 and 8 simultaneously while you are already in the air by pressing numpad 8)