Originally Posted by
BuzzBox
Yes, the B744 pax oxygen system uses a number of oxy bottles - 13 if I remember correctly. They allow for extended depressurised flight above 10,000ft, eg oceanic sectors, flights over high terrain where immediate descent to 10,000ft isn't available.
I think the number of O2 bottles is a customer option with those choosing more bottle having the capability to use 14000' for an altitude for emergency descent with Pax onboard