How high can a fly fly before it dies?

Most insects can fly as long as they are in air that's about fifty degrees Fahrenheit, or warmer. If the air temperature at ground level is about seventy degrees, insects have about thirty-six hundred feet before they hit the ceiling and it's too cold. On ninety-degree days, that border is at about six thousand feet.



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All drain flies submerged for less than 5 h lived; 3 survived 3 h of submergence, and 4 others survived shorter test durations (100% survival). Following approximately 5 h of submergence, 2 of 4 flies died and 2 lived at least 24 h after release (50% survival rate). Two flies left submerged overnight died.

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The reason planes cruise at high altitudes is that they burn less fuel and can fly faster, as the air is less dense. At 30,000 feet and higher, it is also possible for aircraft to avoid weather systems, making it more comfortable onboard.

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Nevertheless, certain exceptional aircraft like the Concorde and the Tupolev Tu-144 have managed to ascend to altitudes of FL600 (equivalent to 60,000 feet).

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