Depends on route and plane.
I'm in LA and I'd prefer to fly from LAX, SFO, SEA or YVR as to maximize the time in J. According to seatguru there are 2 types of A330, one with new J one without. How can I tell which route has which?
AFAIK, no 744 has the new J.
I know. Even more annoying is they were flying 748s to LAX during the winter but stop switch to 744s during the summer.