That's a strange equipment placement. My initial thought was maybe they are taking some A321Ts for the cabin refurbs and putting a 77W to cover the capacity but it's only running on that Saturday 10/26 based on the timetables in EF. I wouldn't be surprised if it comes off the schedule and you get reverted to a 321T. If your award was a true F award, then they should at least give you back the point difference if they put you in J.