Do you mean the east coast?
I would guess if Northern Ireland ever gets scheduled transatlantic flights again then JFK, EWR or BOS are much more likely that SEA, SFO, LAX etc.
I think I read on another forum that EI would have problems using the A320-lr on the DUB-MSP route so west coast would be out.
Not sure that they could operate the A320-lx to the east coast of the USA from BHD?