Hi Nash! Just down the road aways from ya in Westport. I would ask your travel agent or the cruise line about this. I know they have it for Royal out of NYC since my BF's parents took it. But I think they booked the bus through AAA. There should be some sort of bus though.
It is my understanding that they only have bus transfers from JFK and LaGuardia airports. The number for this is 800-327-7030. I'm not sure if they have a two week cut off for reservations before your cruise.
Hope this helps