Maybe for the Flyers game they were shipping the Bruins back to Boston in a box? I don't know. It's a kickass song either way (I'm sure they only play it because it was in the Departed).
Well the Bruins won in OT anyway....

But yeah, I figure they figure it has that popularity because of The Departed. They never actually get to the "Shipping up to Boston", part of the song, just the intro. It's just strange to me, as a Boston fan, for all sports, to hear that song being played by other teams. Hell, when the The Departed soundtrack first came out, and that song was not as well known, I would listen to it thinking they have to get this song into Sox games somewhere.