When the air-plane reaches to the altitude of about 12,000 m or so, the airplane's outside cover is very cold due to the air temperature or very hot due to the friction? Or it depends on different parts of the airplane?
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1Related: https://aviation.stackexchange.com/questions/23747/what-is-the-typical-temperature-of-an-airliners-hull-during-flight – Peter Kämpf Oct 02 '17 at 08:23