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The plane pushes against the air, right?
Picture a different scene. You are in a canoe in a raging river, but you have a pole, and you are using it to push your way up the river. The water is going past the canoe at a very high speed, but since you aren't pushing against the water, this doesn't matter. You push against the ground with a pole.
Here, the plane isn't pushing against the runway, it's pushing against the air. The runway doesn't matter.
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