I've already booked the 1st AM flight into BOS / LGA, but haven't decided on return flights yet. Leaving the 1st flight of the day Monday may miss some activities later in the morning.

I'd expect a similar opening in both locations to what was done in MSP:

Sunday:
1st flight early AM from MDW-MSP gave out tour and coupon books for Mall of America. It looked like they had t-shirts etc too but those weren't given away in time for the first flight out.

Coming from MSP, the 1st flight early AM to MDW had Wifi and was flown by a special father-and-son crew. MSP had commemorative cookies, coffee, and chap-stick there.

Monday AM (in MSP)
This is where more corporate presence was noted. Free laptop cases, more cookies, free massages, laminated bag tags. CEO Gary Kelly made an appearance for a press release/grand opening ceremony Monday late morning.