Originally Posted by
flights_1
I haven’t flown American much - is the last minute change in configuration common? Or is it that the seating plan is fixed and it is potluck whether you get all fwd facing or back/fwd facing seats?
It's complete potluck. You won't know until around T-48 hrs to the flight which config is scheduled for the flight, and even then it can change on the day of departure, especially so if you're departing from a hub.
Now most LHR 772 routes do tend to get the better all-forward config more times than not, but again there's no guarantee.
Below is the 772 thread detailing how to track which one you'll be on.
Aircraft guide: Which 777-200ER / 772 / 777? (2019 on)