Use of the A320 for the Atlantic has been crossing my mind too of late. What about a Cork to JFK via St Johns, Newfoundland (YYT) for fuel and seek a 5th freedom from the Canadians to operate flights St Johns - JFK if the Ireland Canada bilateral disallows direct pax flights from Cork to St Johns.
I think Continental Express fly St Johns to EWR with ERJ 145LR? An A320 to New York would be a boost to the economy in Newfoundland, an economy that has always struggled due to fishing decline and a lot of the local folk needing to live off social security etc.
An Irish A320 in EI colours might help to do wonders for the local tourist industy in Newfoundland in helping to draw the Americans for fishing and hunting etc? Great circle route from ORK - YYT is 1973 miles so an A320 can easily get that far in range with the necessary ETOPS certification.