I was absolutely amazed last time I was in BOS for the morning push. Every A gate full and pushing. Had 3 DL jets in a row taking off with more chugging over.

Id assume biggest thing with BOS is there is no dominant aircraft. It’s a split of 220/320/330/73/ER. No real primary jet to make a category of. 321neo probably swings the balance to 320 category eventually.