DL 5597 then DL 5679 at Boston
Jacksonville → Boston → Louisville
Timetable, Boston time
15:37DL 5597 from Jacksonville at the gate
09:55DL 5679 to Louisville leaves the gate
18 h 18 apart on the timetable, overnight
DL 5679 leaves 18 h 18 after DL 5597 arrives on the timetable: more than half a day, so not a connection we count.