DDave etc,
My real point was not about crew fatigue but the difference between the BA and AirJam crews on a similar length flight leg. I don't know if the a/c type made this difference but the former were noticably more affected than the latter.
Pax were also more ratty on the BA which, as you say, doesn't help the situation one bit! I think we are all on the same side here: wanting to sort out the best air mix for everyone.
VnV...
I'm too old for anything other than a desk job now !!!!