Just completed a couple of days ago a ARN HEL LHR JFK LAX SFO and return. Boarding the AA flights was very straight forward and organised. Far and away the worse boarding was the final positioning after the above from ARN back to LHR. The whole access to the lane was clogged by non group 1 people, when group 1 was called. They call group 1, and lots of people close to the barrier sort of shuffle without actually attempting to enter the lane to the gate staff. You end up not wanting to be a DYKWIA, but anything less than pushing through means the group system is failing. It was BA0781 which was a 767, on Tues 24th. I think an emergency exit had failed and people in the exit row had been moved, this further ruffled feathers which the crew had to deal with.