Lots of flights delayed in/out of Boston. They told me that the biggest issue now is getting crews where they need them to be due to the rolling delays.
We got very, very lucky. Six of us supposed to be flying post-cruise FLL to Boston. Happened to wake up when the cancellation notice hit at 1:30am. Immediately got in touch with Delta via text on app, which is always a dicey proposition. I pointed the rep to six remaining seats on PBI-BOS, which was five hours delayed, giving us plenty of time to get to the airport, and we can wait in the lounge. Definitely could have been worse.