I like the late flights to LHR because it increases the likelihood that I'll actually sleep on the flight. (I generally have not problem sleeping on planes, but if the departure is too early, I do have a hard time falling asleep.) So my strategy on these flights is to eat before departure -- preferably at home or at a restaurant, but at the airport or an airport club if necessary -- and then put the eye mask on and try to go to sleep promptly after takeoff. That way, I maximize sleep and it doesn't matter what AA (or BA) serves in F. Of course YMMV; I know there are lots of FTer who would never dream of sitting in international F and sleep through the slop that will be served them.