Anoxia v. dangerous and pernicious, so one should always be careful.
But anyone like me brought up on First World War memoirs - 'Sagittarius Rising', etc., must puzzle of the high altitude flights and fights claimed by those heroes. Did their altimeters under-read, or was their endurance sufficiently short that pilots usually got away with it?
Anyone know?
No chance of me emulating them! Strictly below FL10 or plenty of o2 for me!