The wildly unrealistic side of me thoguht when reading the last post maybe they would consider MAN-SNN-BOS or MAN-SNN-IAD. To save all the responses I accept it is merely wishful thinking.
Why on Earth would Manchester to Boston involve pitching up in County Clare? I could see AA flying MAN-BOS on a B75W if BA put their weight behind it at the UK end but never an A318 via Shannon. There would be literally no point.