I would venture to say that BA has the best service. You may want to explore what kind of BA award you can get with AA (as you already have some of their miles). While if you aren't familiar with Int'l F service you may be happy with any of them, your travel experience will be better out of JFK re: lounges and such. Also the flight time BOS/LHR eastbound is often extremely quick, almost a waste of the miles! (BOS/LHR eastbound can be faster than BOS/SFO westbound). I don't know about the AA fleet, but on UA out of BOS you will only get a 767 which doesn't have the finest of seat products. So you will need a NYC flight on UA for the "First Suite". These are a few of my rambling thoughts. Welcome to FT, don't be embarassed about asking questions, and don't get upset when the pissymoany types get all worked up when you "posted in the wrong topic" or asked something that was covered elsewhere 6 months ago.