Sorry, should have been a little clearer. We fly up in the evening, overnight at the Hilton then back home on the daytime BA service.
I don't know if AA would accept the bags right through, and the other contender is that since we're coming from disney we can check bags at the hotel through to a domestic destination, but not an international one.
Smirnoff - I think you're right, DL is the obvious winner...