From the look of it Aer Lingus are looking for something to do with 2 A.321LR's from Shannon. They must be pretty confident that they will be operate from the UK to the US or they wouldn't have kicked this off (or they would look to get them on a UK AOC?), but the response of the Americans could be interesting.
By seeking tenders, is this essentially contract flying for the airports approached? So looking at regional airports that had transatlantic services but have lost them/had them scaled back - MAN, BHX, EDI, GLA? Where else - CWL, LGW, STN? Would the 321LR be usable out of LTN, BRS?