I had a conversation with someone recently who was saying that AA have by far the worst onboard product on the TATL routes from EDI. Their 757s could really do with an interior upgrade - I am not sure if this is planned though.
AA plan to retire the pre-merger US Airways TATL 757 fleet and are refurbishing the pre-merger AA international 757 fleet, which is all meant to be done by the end of this year.