B6 618 then DL 5679 at Boston
New York JFK → Boston → Louisville
Timetable, Boston time
16:59B6 618 from New York JFK at the gate
09:55DL 5679 to Louisville leaves the gate
16 h 56 apart on the timetable, overnight
DL 5679 leaves 16 h 56 after B6 618 arrives on the timetable: more than half a day, so not a connection we count.