And how many closed? In the 8 years I've been here, 73N CVG is the only base to close, but SLC lost all WBs, and DTW/SEA lost the semi-WB category (7ER)

My thought is BOS 330 was opened as a small category that they figured would be mainly manned by people who either live there or won't move there, and once it's been long enough BOS isn't a "New Base with funded move" a NB category will open up.

I moved to NJ and swapped the 7ER after getting sick of seeing if the "coming soon" BOS 320 base ever popped open and was going to jump on that and take a funded move to base.