Quote:
Originally Posted by RINGLEADER
The thing I pulled up said 4-5 — but at cruising altitudes if 30K to 40K feet.
Damn you Internet.
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I'm not sure what you pulled up, but commerical aircraft aren't pressurized at 4 to 5 psi at any altitude. The passengers wouldn't like it much... That's what it's like at the summit of Everest.