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.
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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.
To summarize, a Boeing 747 is incapable of ascending up to 60,000 feet. The highest altitude a commercial jetliner can reach is approximately 45,000 feet, while corporate aircraft can fly slightly above 50,000 feet, but only if they are specifically designed for that purpose.
Different airplanes have different maximum altitudes, depending on their construction. For example, the Airbus A320 has a maximum altitude of 39,000 feet (11,900m) and the Boeing 747 45,000 feet (13,700m).
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.
The sweet spot of flying is regarded as between 35,000 and 42,000 feet (the airline industry still uses feet and inches as its standard measurements) – too high and the oxygen becomes too sparse to fuel the engines, too low and the air resistance is greater.