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I never said the airplane wasn't moving.
What you said was that the following was wrong:
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3. Air will never move over the wings unless the plane makes forward progress on the runway.
However, since the runway and air molecules are relative to one another, in order for the plane to move across the molecules it would have to also move across the runway.

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I just said the conveyor belt was irrelevant to the moving of the airplane because the plane's thrust doesn't act on the ground, it acts on the air.
Right, which means that the plane has to move foward down the runway despite the efforts of the moving belt, which it will because of precicely the reasons you state.

I agree with you- I'm just pointing out why I didn't see it on your first post.
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-Jeff
Rome did not create a great empire by having meetings; they did it by killing all those who opposed them.