AA 2456 then DL 5679 at Boston
Chicago O'Hare → Boston → Louisville
Timetable, Boston time
18:15AA 2456 from Chicago O'Hare at the gate
09:55DL 5679 to Louisville leaves the gate
15 h 40 apart on the timetable, overnight
DL 5679 leaves 15 h 40 after AA 2456 arrives on the timetable: more than half a day, so not a connection we count.