Dont be too sure that AA in Cork is highly unlikely. They are only operating a 757 on the Shannon service, and thats only to comply with the "RULE" as DUB is their main focus. I have it directly from a very reliable source within AA, that Cork has their interest once the new terminal is open. The obstacles mentioned : Airbridges ~ Cork will have 2, Runway Length ~ not a prob for a 757, Weather ~ the only remaining problem.
As I say, watch this space.