Liquid aviators breathing oxygen (LOX). Oxygen can be serviced to the aircraft in a liquid state. The advantage of LOX is that it has a nine hundred-to-one expansion ratio. In other words, one liter of LOX will expand into 900 gaseous liters of ABO.
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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.
All flight crew members of pressurised aeroplanes operating above an altitude where the atmospheric pressure is less than 376 hPa shall have available at the flight duty station a quick-donning type of oxygen mask which will readily supply oxygen upon demand.
With loss of cabin pressurization at altitude, pressure breathing of 100% oxygen at high airway pres- sures enables the pilot's alveolar PO2 to be maintained at a safe level during emergency descent.
You can use an FAA-approved portable oxygen concentrator (POC). Some airlines offer in-flight oxygen for a fee. You can't use compressed gas or liquid oxygen on the plane. When you make your reservation, tell the airline that you'll be using oxygen during the flight.
Values >95% on room air suggest that inflight hypoxemia is unlikely and that further evaluation is likely not necessary. Patients with saturations <92% on room air at rest should receive supplemental oxygen inflight, because they are at high risk of hypoxemia at altitude.