How do planes not run out of oxygen?

The answer to this question is actually relatively simple: Airplanes get fresh oxygen to use in the cabin from the air outside the fuselage. Regardless of the airplane's size or flight elevation, there's plenty of fresh oxygen available in the surrounding air.



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If anything happens to the pressurization system, or the plane experiences any difficulties while in flight, oxygen masks will deploy. Oxygen masks supply roughly 10-14 minutes of oxygen, which is more than enough time for a pilot to descend below 10,000 feet, where the atmosphere has enough oxygen.

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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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A loss of oxygen to the body causes causes something called hypoxia, the effects of which are confusion, cough, nausea, rapid breathing, changes in skin color, and headaches. If oxygen deficiency continues over a long enough period of time, it can cause unconsciousness, permanent brain damage or even death.

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The air on a plane contains less oxygen than the air we normally breathe in. This leads to lower levels of oxygen in the blood. If you do not have a lung condition, the drop in oxygen is not enough that you would feel the difference.

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About 40 percent of a cabin's air gets filtered through this HEPA system; the remaining 60 percent is fresh and piped in from outside the plane. “Cabin air is completely changed every three minutes, on average, while the aircraft is cruising,” says Becker.

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— One of the most well-known crashes involving hypoxia was the 1999 crash of a Learjet that lost cabin pressure and flew halfway across the country on autopilot before running out of gas and crashing in a South Dakota pasture, killing professional golfer Payne Stewart and five others.

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Most aircraft cabins are pressurized to an altitude of 8,000 feet, called cabin altitude. Aircraft pilots have access to the mode controls of a cabin pressure control system and – if needed – can command the cabin to depressurize.

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According to USA Today, the common cruising altitude for most commercial airplanes is between 33,000 and 42,000 feet, or between about six and nearly eight miles above sea level. Typically, aircraft fly around 35,000 or 36,000 feet in the air. To put that in perspective, the peak of Mount Everest measures 29,029 feet.

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Airplane ear occurs when the air pressure in the middle ear and the air pressure in the environment don't match, preventing your eardrum (tympanic membrane) from vibrating normally. A narrow passage called the eustachian tube, which is connected to the middle ear, regulates air pressure.

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Shortly after takeoff you may feel a sinking sensation, that happens when the flaps are retracted, allowing the plane to accelerate. You may also hear the engines throttle back, sometimes ATC asks us to level off because traffic is above us.

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The inner pane basically safeguards the load from the passengers during flight. When both the outer and middle panes break, then all the pressurization in the airplane would escape leading to decompression in the passenger cabin. A plane is pressurized for passengers' comfort as it climbs to a higher altitude.

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Peak pressurized cabin altitudes ranged between 6,050 and 8,450 feet when cruising altitudes varied between 29,000 and 37,000 feet. In the former analyzer, the lowest oxygen concentrations noted were about 15.2% (15.5 torr), while in the latter, they were 17.6% (133.7 torr).

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Answer: No. The cabin is pressurized between 6,000 and 8,000 feet on long flights. Adding supplemental oxygen is not necessary, because the percentage of oxygen is the same as being on the ground at those altitudes.

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Choose a seat in the middle of the plane. As the air circulates across the rows and not up and down the plane, some experts believe the worst air is in the front or the back of the plane. Stay well hydrated by drinking lots of fluids (water or fruit juice) and avoiding caffeine and alcohol, which will dehydrate you.

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