Thread drift?
On other CASA registered aircraft that fly over Afghanistan etc there are very strict rules and limits regarding the amount of pax O2 available before departing Asia (BKK, SIN, HKG).
On the 744 the PAX oxygen must be full as the 744 has bottled pax oxy but the 767 has chemical oxygen generators good for 35mins.
Question? Are there chemical oxygen generator available for the 767 with greater capacity than 35mins, if so how long would they need to last to get you out of worst case scenario in Afghan airspace mentioned in this thread?
Greater than 14,000 etc
NB I know of other Chemical oxy generators fitted to other aircraft good for up to 45mins but each assy are larger in installation. e.g as fitted to some A330-200