The AA efforts have been handicapped by unwillingness of one airline to
codeshare the route to MIA lest it handicapped their own LHR service; BOS I heard strange murmurings about that self-same airline doing their best to boost their BOS service by hiving off the lower fare pax to route via MAN. DFW was okay for the numbers carried but was not the most effective hub for where AA's ambitions lay....