Answer:
The wings of the aeroplane push the external air backward and the aeroplane moves forward by the reaction of the pushed air. At lower altitude the air is dense and so the aeroplane receives sufficient reactional force to move forward. In the jet plane the external air is sucked into the plane and compressed. Hence for the air to be dense is not only unnecessary but also undesirable. The reason is that jet planes fly with very large velocity. If air is dense, then due to the air-friction the plane will become very hot. Therefore, jet planes fly at high altitude where air-density is very small.
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