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It is only possible when air is strike on the surface of the aircraft due to that compressible wave are produced and it will generates tremendous amount of noise. Air is compressible so we cannot ignore that but amount of the compressibility depends on the speed of aircraft. Normally it can be noticed at speed more than 400km/h.

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Q: What is the effect of compressibility of air on the flight and at what velocities it becomes relevant?
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