You could find faults for every airport. Anywhere in FL is bad because hurricanes could hit. Anywhere up north is bad because there is snow. Anywhere in CA is bad because who know, an earthquake is possible. There's always a downside no matter where you go. BOS is a great place. If B6 didn't go to BOS, where would they go? Plus BOS has lots of gate space opening up, with DL/Song/CO getting a new, great terminal. Let B6, Song and AA duke it out in BOS!