And that at cabin altitudes above 14,000 feet pilots must use oxygen at all times. And that above 15,000 feet each occupant of the aircraft must be provided supplemental oxygen. All of this is spelled out in Federal Aviation Regulations Part 91.211.
People Also Ask
The highest certified altitude of an airliner was Concorde's 60,000 feet. Today some of the corporate jets can fly at 51,000 feet. Q: What is the highest cruising altitude allowed? A: Most airliners are limited to 45,000 feet or less.
A series of Navy and Air Force programs in the 1950s and 1960s used pressure vessels or pressure suits to get balloonists higher, some to above 100,000 feet. Skydiver Nicholas Piantanida set an unofficial record—123,500 feet—in 1966, but a later attempt went awry when his helmet depressurized.