Ouch, I wonder how long the B6 Boston flights will last. I travel to Boston fairly often for work, but always take US as they are my company's preferred carrier on the route. I know DL flew the route a couple years ago, but the times and frequency weren't that great and it didn't last long.
Did you notice FL moved over to A? And I heard UA is moving to A at the beginning of the year. I hope they open up the rest of the A concourse, and as many RON's that WN/FL have, I think they'll need the gate space. I know in the early morning WN has what seems like aircraft at almost every gate in A (and a UA regional jet, I think the Denver flight).