Airlines these days cruise at around 35,000 feet, some higher and some lower, but without protection at these altitudes a human being cannot survive.
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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.
Importance to MembersAnd 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.
For operations conducted under Parts 121 and 135, the flight crew must use oxygen when cabin altitudes are above 10,000 up to 12,000 feet after 30 minutes and at all times when above 12,000 feet. The general aviation pilot flying an unpressurized airplane will not normally operate above 25,000 feet.
At 30,000 feet and higher, it is also possible for aircraft to avoid weather systems, making it more comfortable onboard. Referred to as turbofans, the engines on modern jet-powered airliners are most efficient when used at high altitudes.
Therefore, routes are often broken up using smaller aircraft along the way. Altogether, commercial airliners have the physical capability to travel up to 43,000 feet.
In aeronautics, hypoxia typically results from a decompression or lack of pressurisation of the aircraft cabin. Hypoxia occurs within a few minutes if the cabin pressure altitude rises to between 5,000-6,000 m (about 16,000 - 20,000 ft).
In 1985, The Guinness Book of World Records recognized Vulovic as the world record holder for surviving the highest fall without a parachute: 10,160 metres (33,330 ft; 6.31 mi).