DL 5684 then B6 8446 at Boston
Cleveland → Boston → New York JFK
Timetable, Boston time
09:01DL 5684 from Cleveland at the gate
09:00B6 8446 to New York JFK leaves the gate
23 h 59 apart on the timetable, overnight
B6 8446 leaves 23 h 59 after DL 5684 arrives on the timetable: more than half a day, so not a connection we count.