Jimmys right on this one. Seems like Guppy is one of those guys that thinks the world extends from JFK to LAX....
We not only have depress escape routes for much of our network (which includes Himalays, Rockies, Alps, Iran (We're not over Afganistan again yet Induces- so the MSAs are only 17000'!) but we also have SE Driftdown procedures as some route have MSAs higher than out SE ceiling above a threshold weight.
there's oxygen on board to do that,
Yep, 21 mins worth for our pax in the 777 (14 in the A343
) and a requirement to be below FL150 before it runs out.