Why climbers climbing high mountain peaks need oxygen but airplane passengers flying in high altitude don’t need oxygen?

Question

Why climbers climbing high mountain peaks need oxygen but airplane passengers flying in high altitude don’t need oxygen?

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Answer 1

Because airplanes are pressurized to altitudes much lower than those mountain peaks. Airplanes are pressurized to somewhere between 6,000 and 8,000 ft. You absolutely do not use supplemental oxygen when climbing mountains this height. In fact, there are major cities at those altitudes where people live their entire lives. Climbers typically only use supplemental oxygen when going beyond 26,000 feet.