AA 3857 then DL 5679 at Boston
Syracuse → Boston → Louisville
Timetable, Boston time
14:27AA 3857 from Syracuse at the gate
09:55DL 5679 to Louisville leaves the gate
19 h 28 apart on the timetable, overnight
DL 5679 leaves 19 h 28 after AA 3857 arrives on the timetable: more than half a day, so not a connection we count.