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there are four forces that must equalize essentially.... lift and weight , thrust and drag...

thrust is produced by engine through jet or propeller and must equal or overcome drag which is created by friction and the effects of air pressures over the surfaces of the craft

lift is produced by the forward motion of the airfoil (wing surfaces) and must equal and/or overcome the force of gravity (weight)

thrust and lift work to keep the aircraft in flight, while drag and weight work to bring it down

that is a really simplified answer though

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Q: In order for an airplane to fly what must happen to the four forces?
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