Allegedly being the operative word here. Can't say I'm really looking forward to the denser oxygen levels onboard the dreamliner, I definately won't be making my flying decisions based on that.It is not the pressure that is important (although it does fall with increasing altitude), but the oxygen content. Pressurising a cabin to a lower altitude will increase the oxygen content and (allegedly) improve jet lag.
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Yes, but in the context of the quote, it was in reference to the A380 which has a cabin altitude of 5000, the reference to the 777 was pointing out it is a difference not mentioned in an earlier post which is now referenced.
In actual fact it is a pressure thing...oxygen content at 40,000ft is practically the same (percentage wise) as it is as sea level but there is just not enough pressure to deliver it to the lungs.