Andrew Koenig wrote:
"Gord Beaman" wrote in message
...

And don't expect to be able to tell the difference either. I flew
some pressurized but mostly unpressurized aircraft for over 25
years and I defy anyone to tell the difference between sealevel
and 15,000 as long as they're not physically working, are in
average physical shape, cannot see outside the aircraft and have
no instruments...so this particular 'coach experience' claim is
just hype...

Once I visited the observatory at Mauna Kea, which is at 13,800 feet
elevation. Based on that experience, I find it hard to believe that
*anyone* couldn't tell the difference between sea level and 15,000 feet --
at least not after returning to sea level.


You don't have to physically work very hard to notice. I noticed the
effects of the reduced oxygen content at 12,000 feet just by what I had
to do to turn around and reach back to shut the rear seat air vent in
the Navion.