But, that speech carries a beautiful message regarding self-care. The Oxygen Mask Rule is simple: if the cabin loses pressure, oxygen masks will fall from above. You are to place yours on yourself before trying to help others.
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The masks are only meant to keep passengers supplied with oxygen until a pilot is able to bring the aircraft down. Up in the cockpit pilots get their own oxygen masks. Once they're outfitted, they maneuver the plane to less than 10,000 feet in altitude, where passengers will be able to breathe more easily.
Without oxygen, you will quickly feel drowsy and even euphoric, a phenomenon known as hypoxia, but as time passes, continued lack of oxygen to the brain will lead to blackouts, passing out, and possibly even death.
The only oxygen equipment allowed on an airplane is the portable oxygen concentrator (POC). If you need oxygen in flight, you must take a portable oxygen concentrator with you, and , you must let your airline know ahead of time.
When you fly on an airplane, the flight attendant instructs you to “put your oxygen mask on first,” before helping others. Why is this an important rule for ensuring survival? Because if you run out of oxygen yourself, you can't help anyone else with their oxygen mask.
Oxygen masks in the overhead Passenger Service Unit (PSU) limit the number of persons in that seat row. Most often, but not always (it is aircraft specific), there is one spare mask in each row; a group of 2 seats has 3 oxygen masks, a group of 3 seats has 4 oxygen masks, etc.
The only oxygen equipment allowed on an airplane is the portable oxygen concentrator (POC). If you need oxygen in flight, you must take a portable oxygen concentrator with you, and , you must let your airline know ahead of time. They may require a doctor's letter to verify the need for the POC on the plane.
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.
After about 20 minutes without supplemental oxygen, you will be pronounced dead. By the time you get to 35,000 feet, EPT drops to 30 to 60 seconds and it falls to nine to 15 seconds at 45,000.
These U.S. airlines do not require masksAlaska Airlines: Masks are optional. Alaska immediately moved to make masks optional on its flights following the April 18 ruling. American Airlines: Masks are optional.
(3) Whenever a pressurized aircraft is operated at altitudes above 35,000 feet MSL, at least one pilot at the controls shall wear, secured and sealed, an oxygen mask required by paragraph (b)(2)(i) of this section.
More specifically, it's all about cabin pressure – which is why Southwest passengers were told to use them back in 2018. The air at high altitudes is thin, and oxygen levels very low, so aircraft have clever systems in place to keep cabin pressure at a level equivalent to an altitude of around 5,000-8,000 feet.