Eli5 why do airplanes have to fly so high?

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I was on a flight looking down at the cars on the highway and it hit me, like the higher you go the higher the radius is to cover the same distance as ground transportation. I’m sure there’s a cool reason and history. To make up for the extra fuel to get up that high and the extra miles added. Anyone? Does it have to do with less air pressure. And the efficiency aerodynamic wise? Or noise pollution? Visual pollution? I just always took it as a non ask, “We’re this high, cuz we’re in a plane. Duh”

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Anonymous 0 Comments

It’s alot more fuel efficient because air resistance is lower at higher altitude, and import consideration when your travelling several hundred miles an hour.

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