"Gary Mishler" wrote in message news:eBoKb.745162$HS4.5776347@attbi_s01...
"running with scissors" wrote in
message om...

"they" dont. cabin pressurization is normally at 8000ft though crew
may elect to use different cabin pressures under certain circumstances

Actually, it depends on the aircraft. Aircraft are certified to certain
"differential pressures" which is the difference between in the inside cabin
pressure and the outside ambient air pressure.

We were talking about transport aircraft. US certificated transport aircraft
must keep the cabin altitude below 8000'.