On cabin plane

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As the aircraft climbs in altitude after take-off, the decreasing cabin air pressure causes gases to expand. Although aircraft cabins are pressurized, cabin air pressure at cruising altitude is lower than air pressure at sea level. An additional charge is often levied on passengers who require supplemental oxygen to be provided by the airline. Gas expansion As the aircraft climbs in altitude after take-off, the decreasing cabin air pressure causes gases to expand. This is not usually considered a problem. Oxygen and hypoxia Cabin air contains ample oxygen for healthy passengers and crew.

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