On 10 Mar 2004 23:29:43 -0700, Blanche
wrote in Message-Id: :

There's a really big difference between the FARs and your body's
requirements. Just because you are allowed doesn't mean you should.

I'm sure you are correct about the difference between individual
tolerance to hypoxia. I recall reading that General Yeager was able
to withstand operating at 20,000' without oxygen.