Two A321LRs would fill three 130-seaters leaving Shannon and that’s assuming everyone connected. But then what do those aircraft do after their first run? I think you need far more transatlantic flights to start feeding a small network, so unless other airlines come in numbers are awkward. It just seems to need a big ramp up in scale to work.
don't discount a BHX or MAN. The connecting traffic to the US both is huge..Neo could do LHR and the 320 one of those...