Jagman1 - BALPA doesn't say very much about it. It's within FTLs and Bid Line Rules because BA moved the report at LHR to 17:55L which puts it 5 mins within the acceptable band for 3 crew. That said, it only takes 40 mins delay to trigger the Bid Line requirement for the fourth man (you can guess what Ops usually say when you ask for one) and a further 30 mins before you are into discretion, less if you are un-acclimatised. It's only 3 man for the summer season as the average flight time for the return leg in winter exceeds the Bid Line 3 crew limit. Were it not for the ruthless efficiency at the Hong Kong end and the lack of holding at LHR at the planned arrival time I doubt it would meet the 3 man limits even in the summer.