I think the new AA will play its hand at BOS. They currently have the most flights (although not the most available seats) there. It's possible SFO comes back. And maybe service to CMH, IND, and/or STL. However, the 75Ls can reach all of the cities in Western Europe except for Italy. That gives AA the opportunity to have maybe 4 or 5 destinations served from BOS. And the O&D traffic as well as the connection possibilites can easily fill up a 75L.