In that case...
CS,
In that case, you (and the App) might be able to clarify something for me about O2 limitations.
From memory, the FARs allow the pax to be carted around DP at F140 without O2 (15-25 min OBOGS) but not FAs, who have to be supplied with O2 after 30 mins between F100 and F125 or at all times above F125 - is that still the case?
If it is, then I also believe that the FA O2 supply would be additional to the first aid oxy which is for the pax rather than the crew. My understanding is that first aid oxygen is like contingency fuel, in that you can't plan to use it for other than its primary purpose.
If all of that is true, do you know how operators carry enough O2 down the back to make the famous "DP @ F140" scenario work?
[I think those operators would be non-EU, since I think they state quite plainly that the DP scenario is at F100/10K']