In article ,
Pat Flannery wrote:
And we need a placebo group to check this out where the oxygen masks
come down but _don't_ deliver oxygen to the passengers.
...

I think it is difficult to make categorical statements about what might
have happened differently if supplemental oxygen masks were not depoloyed.
The group of people who fly on commercial airlines aren't exactly NASA
astronauts. There is a huge crosssection of ages and health issues that
are not well sampled by tests performed on 24 year old males in peak
physical condition.

Craig
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