Possible its been discontinued as the situation in NYC has improved somewhat. BOS/ORD still overnighted

Sat is the first day with J available.

EI is offering MAN - DUB -JFK in June but hard to have any trust in the schedule.

IE - UK, lucky to see double digits onboard, even flights cancelled when no one showed up at the gate. You won't get far at Dublin unless you are a US resident or citizen or otherwise specifically invited by the US authorities to travel.