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When hypoxia becomes real

As a late blooming, somewhat studious private pilot who earned his certificate at age 75, I certainly learned, knew, and could recite the Federal Aviation Regulations that relate to the use of oxygen while flying at altitude in an unpressurized aircraft—no doubt. I did not really understand, much less comprehend, however, just how dangerous a situation a pilot can find himself in when actually experiencing real hypoxia until a recent cross-country flight.