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At cruising height the outside air is so thin and cold the cabin must be pressurized to keep you safe

Passengers aboard a commercial jet cruising at 35,000 feet sit just inches from air so thin it would cause unconsciousness in under a minute. The cabin pressurization system, which compresses outside ...
National Academies of Sciences%2c Engineering%2c and Medicine

The Airliner Cabin Environment and the Health of Passengers and Crew

Commercial jet aircraft are designed to carry passengers safely and comfortably from one point to another. The external environments of the aircraft include taxiing, takeoff, cruise, and descent; ...
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Here’s How The Boeing 737's Cabin Pressurization System Works

Step aboard any Boeing 737, shut the door, and watch the world outside shrink behind double-paned windows. As the big jet climbs, its cabin pressurization system begins to invisibly pump steadily more ...