Originally Posted by Darren
Keep in mind, though, that AA doesn't have a SFO-LHR flight so you would be forced to take BA. If you decide on crediting the miles to AAdvantage, you won't be able to earn miles on that flight.
Or you could use your last NA segment by adding a short QF flight, JFK-YVR-DFW-BOS-ORD-SFO
-YVR-LHR-GIB, with full AA credit should you want it.