Just a question on the Himalaya-crossing question - is it not the case that routes between Singapore and Europe tend to track south of the Himalayas (hence no special oxy requirements) but those out of Bangkok are more likely to track over the Himalayas (and so require extra oxy)?
Hence twins running ex-Singapore are fine as they are, but ex-Bangkok will need the extra oxy? Could this be why BA use 777s via Singapore and 744s via Bangkok?
GC tracks over the hump
Thanks