In the United States, there are no specific provisions for aircraft operations above 60,000 feet for civil aircraft, and most existing applications are limited to military operations.
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Some corporate airplanes can fly up to 51,000 feet. The Concorde flew up to 60,000 feet, and the all-time high flier was the SR-71 which could go over 80,000 feet.
There are no specific regulations governing civil aircraft operations beyond the altitude of 60,000 feet. 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).
Aerodynamic altitude: If a commercial airliner flies too high, it will encounter less dense air passing over the wings to create lift. This can cause the plane to stall and fall out of control. Depending on the weather conditions and aircraft weight, this can occur anywhere between 40,000 and 45,000 feet.
A: No commercial or business airplane flying today can exceed 100,000 feet. Special rocket-powered airplanes can fly over 100,000 feet to gather data, but they are specially designed for it.
Can you fly at 80000 feet? The US Air Force U-2 reconnaissance aircraft flies at 72 000 feet almost every day for many hours. The world's fastest manned aircraft, the SR-71, flew for many years at 80 000 feet and higher.
For starters, the engine may suffocate from a lack of oxygen. Engines work by mixing air with fuel to create combustion. The higher an airplane flies, the less air the engines will receive. Second, the airplane's wings may fail to produce a sufficient amount of lift to maintain its current and excessive altitude.