DL 499 then DL 5679 at Boston
Denver → Boston → Louisville
Timetable, Boston time
17:27DL 499 from Denver at the gate
09:55DL 5679 to Louisville leaves the gate
16 h 28 apart on the timetable, overnight
DL 5679 leaves 16 h 28 after DL 499 arrives on the timetable: more than half a day, so not a connection we count.