Originally Posted by
PNWFlyer
There is a reason for that. Pressurization differential pressure maximum is 9.4 psid, so the cabin altitude is only 6000 feet when at 43,000 feet. That is a big difference, especially if you are a frequent flyer.. or a 60+ year old pilot.
Plus no bleed air. Using electrical air compression *might* be less harmful to one's health.