Originally Posted by hillrider
I have been doing SFO-Europe in J for the last 5 years between 5 and 12x/year. By far the best is BA's latest flight out of SFO (currently leaving at 19:30), but you can't use your miles for it. As someone here posted, you can go to YVR on AS to pick up BA, but apparently it's no easy transfer and it doesn't work on the way back without overnighting in YVR; other Canadian cities are a one-stop flight on AA out of SFO.
US to International at YVR is a pretty easy connection as long as you have baggage checked through. There's a special way for these connecting passengers and there is only a quick customs/immigration check - there's no security check or anything like that.
BA is running an extra (earlier) LHR-YVR flight on some days this summer, that might make it possible to connect to the AS YVR-SFO flight...