Originally Posted by COMDOC

FWIW on 01 July 2023 AA swapped aircraft from 787-9 to 787-8 for AA 728 PHL-LHR at the last minute (from our perspective). We were a family of 3 traveling on the flight. My home pre-printed BPs were no longer functional/accurate for either seat assignments nor did they work for boarding the aircraft (they had to be reprinted). We originally had MCE Seat assignments which were shuffled/changed with the aircraft change - with one being moved back to main cabin and one moving to a center seat in MCE. It appeared that at least two pax lost on the musical chairs and had to deplane with their luggage to be rebooked.