B6 doesn't fly the A319, just the A320 and the E190.

Why would BOS have more service than JFK? BOS is a smaller market with less connecting potential than JFK (not much anyway in JFK). At the moment B6 should start to fly any route within range with an E190 to build up the market. Unless the route needs more than 300 seats, 3X daily should be the minimum. Also, any JFK route over 2X E190 should be exclusively A320 because of JFK slot restrictions. You leave MSP-SEA blank, does that indicate A320 or E190? Both would be fine.

I would keep B6 out of MSP anyway but MSP-BOS at 450 daily seats would be insanity. You leave MSP-JFK at 250 daily seats, what is the point of that?

I still think that there are many airports more important than MSP to add to the B6 network.

To sbm12, B6 would want to go into MSP (or any city) with 10X daily because it evens out advertising costs between 10 flights, instead of 1-3 flights.