Originally Posted by
18sas
Call SMS. When the equipment change happened, they randomly assigned me a seat in Row 1, and I couldn't bring up the seat map to change it. I called SMS, and the rep modified something. After that, I was able to view the seat map online and choose my seats.
I believe not being able to change seats has more to do with the schedule change than anything else. My LHR-JFK flights all changed times after this upload and the "Select Seats" option became disabled; only a call to SMS or Reservations can fix it for now...