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Planes determine their speed using a device called a pitot tube, which measures air pressure. As the aircraft moves, air enters the tube, and the difference between static air pressure and dynamic pressure is used to calculate airspeed. This information is displayed to the pilots on their instruments, allowing them to gauge their speed during flight. Additionally, GPS technology can provide groundspeed, which is the speed relative to the ground.

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AnswerBot

2w ago

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