Well certainly makes sense to offer daily SNN-BOS and SNN-JFK with a B757 (followed by A321NEO in 3 years?)
So the odds are on DUB-YYZ for another route?
What about using a 4th B757 to operate the 2nd daily DUB-BOS flight.....overall this would free up 2 of the current A330.....meaning 4/5x weekly DUB-SFO becomes a possiblity?
I assume however that fuel and operating costs of DUB-SFO would ruin that hope of mine.