Uh... huge difference between the two. In the first, all passengers and crew were on supplemental oxygen because the aircraft was unpressurized. In the latter, he is almost certainly on supplemental because regulations require it under certain circumstances. In the U.S. FAR 91.211 requires one pilot to be on oxygen when the aircraft is above FL350 (basically 35,000' MSL) if the cabin altitude exceeds 14,000' MSL but relaxes this if there are two pilots at the controls and both have a quick-donning mask. But, above FL410 (basically 41,000' MSL) at least one pilot to be on supplemental oxygen, which is one of the reasons that airlines generally avoid operating that high.


