To show how "random" it could be sometimes for flying the BEST cabin : IAD is supposed to receive the BEST cabin only from January 12 and only on 054/055 rotation. But I just had the pleasure to fly it on AF027 from IAD. It was not a last minute substitution as I knew it would be a BEST aircraft when I booked a week before and saw the 1-2-1 config on the seat map and I was very happy about this