By not having enough lift and air speed under the wings.
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yes it can
The top is rounded in a way and the bottom is flat. This makes lift. That is how a plane stays up in the air.
The shape of the wing is such that when it moves forward the pressure on top is lower than on the bottom, thus air pressure pushes it upward ... as long as the plane moves fast enough.
because the airfoil shape makes tiny air molecules at the bottom slow down and the top speed up. The engine just pushes the plane.
Both - you fly it in the air, but you drive it on the ground.