Norwegian: SWF-DUB (+v/v) $211 RT...
Apologies if this is already mentioned elsewhere, but Norwegian seem to have some exceptional deals between SWF (Newburgh, north of NYC) to Dublin and vice versa.
Not a "mileage run", but you do earn cashpoints, which can be lucrative. I used cash points from previous refundable ticket purchase (earning rate 20%) and paid $56 for a one way fare from NYC to Dublin. Pretty solid.
Excellent for positioning to better deals Ex Europe.
Dates:
July-February, Primarily Monday and Thurs departures from Dub.
Sun-Tue-THur from SWF.