Originally Posted by
Whitemonk Returns
I think people are getting caught up in Boeing spin here, our 30 year old 757s regularly cruise along at 6000 feet cabin altitude but our 737s sit at 8000 at the same level. Both use standard engine bleed as far as I'm aware
Your 757’s are a bit different than ours. At the same altitude the 757 would have a lower cabin altitude because of how it was scheduled but they typically cruised much higher so the actual cabin altitude was the same. All the Boeing older airframes had the same max differential pressure. The 787 is pressurized to a higher differential pressure than earlier Boeing’s and can maintain 6000 feet you FL430.