Not to pick nits, but BOS is not an AA hub.

It is an O&D city. And most of the flights out of BOS are to the other hubs (PHL, CLT, DCA, ORD, DFW, MIA, PHX, LAX, etc.) with a few exceptions.

This has been BOS's raison d'être for years now.

LUS used to have non-stops from BOS to many places, including most cities in Florida and the Caribbean, and even FRA for a time. It was the Wolf regime that decided that everybody flying out of BOS to anywhere --like, Florida or the Caribbean in the winter, the West Coast, or Europe --would have to go through PHL, DCA, or CLT to get to their destination.
(And to sucker them into doing this, they would charge ten bucks less for a ticket from BOS to MCO than other airlines were charging for their non-stops.)

Pre-merger LAA management whittled their once strong BOS operation down to practically nothing. (I think someone posted here recently that there are only 230-something pilots left in that domicile.)

They let BA take over all of the BOS-LHR flying, and handed the Caribbean -- including the once huge SJU operation -- to B6, on a silver platter.

And most of the departures out of the B1 side of the airport these days are E-190's or regionals.

This is why I think BOS's days as an independent crew domicile are numbered.

It is half the size of the LUS BOS base, when it was closed. And the latter was supporting the Shuttle operation, which is now operated by out-of-base crews.