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There are several reasons why jet aircraft fly at high altitude, The main reason is that the air is much thinner, hence the aircraft needs to run the turbines at less power in order to maintain a speed, The less power you run the engines at, the less fuel you use. The other reasons include noise abatement and keeping out of the way of smaller air traffic such as helicopters and piston engined aircraft who are limited to the altitude they are capable of flying at.

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