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True. As a pilot I can say that supplemental oxygen is only required above 10,000ft by law and by not pressurizing to sea level, this saves wear and tear on the airframe. I believe they pressurize the cabin to a maximum equivalent of 8000ft so if you live in Mexico City you will already be accustomed to it. For myself, it just seems to make me sleepy, hungry and thirsty. :p
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