How High Do Airplanes Fly?

Answer

Generally, standard-flight commercial jets fly approximately 8.5 to 10.6 kilometres above sea level. Travelling at higher altitudes and/or speeds, limits oxygen supply. However, most modern military aircraft like the recent edition of the U2 spy plane can reach a height of approximately 27.4 kilometres above sea level. Another military jet plane, the Stealth Bomber, flies as high as 15.2 kilometres in the air.
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