think about this...

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Of course the plane has to be moving relative to the air around it (or the ground if that makes it easier).

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this is it, you need wind over the wings for lift!! a plane cannot get in the air without lift! wtf, i can't believe noone gets this

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Please explain specifically what FORCE is stopping the plane from moving forward (relative to the atmosphere, NOT the conveyor belt).

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isn't the whole premise of this post is that the plane isn't moving?

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oh my freaking god - how many times do i have to say this? NOWHERE in this thread did i say that the plane wasn't moving. you are ASSUMING that the plane isn't moving, and that's why you can't understand the problem.