With Delta poised to announce Seattle to Heathrow, and a Salt Lake City route rumoured as well, it appears that Delta is really coming to town.
However, I really can’t foresee a massive expansion in the NYC to LHR market as this is already kinda saturated, plus Mr Walsh threatened a capacity war already. However, AA are using larger 77Ws now, so they do seem to be increasing seats.
The codeshare should be good though, lots more destinations than with US Airways. Having hubs in the four corners certainly helps!