For decades new pilots been taught that lift is created because the air flowing over the wing travels a longer distance than the air flowing under the wing, and therefore, for the two airflows to meet at the end of the wing, the air flowing over the wing must move faster. This hypothesis is not correct and this video explains why.

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Links:
Prof. Babinsky, wing lift:    • Wing lift Holger Babinsky  
RC Model Reviews:    • How aircraft flaps work