Although passenger planes operate anywhere from 31,000 to 38,000 feet during flight, the relative elevation within the cabin in regards to pressure is nowhere near that level. As anyone who has travelled up a mountainside too quickly can attest to, altitude sickness is never pleasant. Altitude sickness is often caused by rapid ascension, and it can result in discomfort and sickness, especially at elevations higher than 8,000 feet. This is why most passenger planes operate with a cabin pressure that is at or below pressure experienced at 8,000 feet, as well as ensure that this level is slowly and gradually reached for the comfort and safety of passengers.

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