WHY DO COMMERCIAL AIRPLANES FLY AT 36,000 FEET?
May 26, 2015 
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WHY DO COMMERCIAL AIRPLANES FLY AT 36,000 FEET? The short answer? They don’t — at least, not all the time. Even though it does always seem like the captain says, “We’ve reached our cruising altitude of 36,000 feet” before switching off the seat belt sign. So what determines the altitude at which your flight cruises? […]
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