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begin to succumb to the power of gravity because of the decrease in lift

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The first thing that will happen, happened at 264,001 feet, or 50 miles plus one foot: everyone in the plane officially becomes an astronaut.


Once you get into the altitudes you're talking about, the plane has to fly faster and faster to stay aloft. If you have enough horsepower to overcome the thin air, which would suggest you've got REALLY big engine intakes to suck in enough air, you could conceivably stay aloft until you start to run out of fuel.

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Q: What will happen if an airplane fly higher than 300000 ft?
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