That's a good point. Leaving LAX for LHR we do have to be a bit more careful due to just that. Even though we talk about the same procedures for warming thing's up, the Boeing people tell us that it is simply not an issue on the 777, as I understand it, due to the leading edge of the tank; different positioning or more insulation I do not know. I've only flown the LAX-LHR route a few times in the 777, but twice we had fuel temp advisories and never made it close to where we would have been worried, even with Jet A.