not enough aircraft to do both.
Also Aer Lingus used a North American Airlines B757 (N755NA) on lasts nights BOS - SNN which is only arriving now.
Todays 13.30 to JFK is est at 21.00 and no departure time available for tonights JFK - SNN. Will this be done with the B757 or EI A330.
Is the A330 tech in SNN or BOS?