DL 5615 then DL 5679 at Boston
Louisville → Boston → Louisville
Timetable, Boston time
16:01DL 5615 from Louisville at the gate
09:55DL 5679 to Louisville leaves the gate
17 h 54 apart on the timetable, overnight
DL 5679 leaves 17 h 54 after DL 5615 arrives on the timetable: more than half a day, so not a connection we count.