Hi in June we are going to new york for 10 days with our twins , and a week later flying to san francisco for 6 weeks !! We are booked with BA and have booked one child seat as well. i'm just not sure whether i should book the bulkhead position ( more leg room etc ) but have been told that the arm rests are fixed so that may be an issue if the twins want to sleep ( i hope !), anyone had any experience of this ..thanks