I just want to add, JetBlue will be running 5 flights from JFK to Burlington this summer :]. I'd avoid an afternoon departure out of JFK, since you'll likely spend more time in ground delays and taxiing than you will in the air.
They'll be a fine airline for New York to Burlington. It's only like 45 minutes in the air, and they manage to serve a quick beverage service and snacks. Whenever I've flown Delta on the ERJ from JFK to Burlington, they've announced that the flight is too short for service and didn't serve anything.