Can you breathe at 40 000 feet?

Above 40 000 feet, positive pressure breathing with 100% oxygen is required. Without positive pressure breathing, even very short exposure to altitudes greater than 43 000 feet leads rapidly to unconsciousness. Aircraft cabin pressurisation systems were developed mainly to prevent hypoxia.



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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.

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Many large widebodies have a ceiling of up to around 43,000 feet (12,500 meters). The Airbus A380, for example, is 43,100 feet and the A350 and Boeing 787 are the same (although the larger 787-10 and A350-1000 are lower at 41,100 feet and 41,450 feet).

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Planes are *optimized* to fly at certain heights to maximize the efficiency of their engines and their fuel consumption. So jet planes can fly a lot higher than propeller planes, so they do. They fly between 20,000 feet and 40,000 feet because they are designed and optimized to do just that.

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Hazardous weather conditions and larger weather systems can occur over bodies of water. These include thunderstorms, which are extremely hazardous to flights.

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As it turns out, along with being thinner, research suggests people worldwide who live at high altitudes have a lower incidence of both cancer and heart disease than folks who live closer to sea level. Note that these studies were done decades ago. We've known the health advantages of high altitude for a long time.

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If oxygen deficiency continues over a long enough period of time, it can cause unconsciousness, permanent brain damage or even death. So, in order to keep everyone maintained with enough oxygen, the masks fall down and provide a personal flow.

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