I was under the impression that the stop off was going to be either DUB or SNN which would allow pre-clearance meaning that the pax would arrive in to the states as domestic pax rather than international which would save a lot of time.
This service isnt aimed at the general joe bloggs who want to go to New York on holiday its for the high end business traffic who have offices 20 mins away at Canary Wharf.
Most of the seats on these flights will probably be paid for in bulk similar to the RBS deal on EDI-LCY