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It depends upon the airplane and the intentions of the pilot. General aviation aircraft may fly anywhere between 500 feet and 20,000 feet or beyond. A little Piper Cub on a sightseeing trip may fly quite low, while a more complex airplane on a cross-country trip may fly at higher altitudes for better cruise efficiency and terrain avoidance. Airliners typically fly around 30,000 - 45,000 feet which puts them above most of the weather and it's also where the turbofan engines operate efficiently. Military plans may operate higher, such as the Stealth Bomber which may fly as high as 50,000 feet, or the U2 spy plane which operated as high as 90,000 feet.

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15y ago

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