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If throwing a paper airplane, the persons arm is what gives it thrust. The angle at which the wings are at is what gives it the lift it needs to fly. All four forces have to be equally balanced in order for it to fly.
Daniel Bernoulli's Principle states that if a fluid (air) moves faster over a surface, then the static pressure decreases. This works for an airplane also. So when the air moves over the top of the airfoil, which is longer than the bottom route, it has to go faster than the air underneath in order to meet at the end at the same time. The pressure decreases above the wing and the higher pressure below the wing pushes the wing upward, creating lift...
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