Why Planes Fly So High
We’ve all been flying high ever since the development of the jet engine in the mid-1950s. But why were jets designed to fly at those high altitudes in the first place? At the optimal cruising altitude of about 35,000 feet, there’s less air and that’s what engineers, passengers and airlines prefer. This means that airplanes don’t have to produce as much thrust to maintain the speed necessary to fly. Here’s more from host Hank Green and SciShow.
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