Oxygen masks will drop from ceiling during emergencies, how about during regular flights?
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Commercial aircraft are pressurized meaning that they suck in outside air and force it into the cabin to maintain air pressure.
Aircraft are limited to flying at around 10,000 ft without pressurization because above that the air pressure is so low that the average human will have trouble breathing.
The problem though is that you want to fly higher because that same thin air means you can travel faster and use less fuel.
Fighter jets get around this by making crews were masks that give them air to breath.
While this is impractical for commercial planes, so instead they pressurize the entire cabin.
The masks that drop during an emergency are their to help people breath if they lose cabin pressure at altitude, at least until the plane can descend to 10,000ft where the passengers can breath outside air.
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