For the last 14 years SNN-JFK during the winter has been for the most part very successful
What's the ball park load factor like in February with an A330-300?
It's way too big for the route in the quiet season surely.
The B767-200 and the B757-200 have the same capacity as near as dammit, it's just that most fly the B767-300 these days which is bigger. Continental have the option of the B757-200 or the similar but longer legged B767-200, hence Shannon gets the B757.