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

You’ve already gotten several answers.
Adding FAA regs.

14 cfr § 135.89 stipulates the rules on oxygen. They start at 10,000 Mean Sea Level. Above that oxygen considerations need to be made for pilots.