AA 4391 then DL 5679 at Boston
Madison → Boston → Louisville
Timetable, Boston time
10:23AA 4391 from Madison at the gate
09:55DL 5679 to Louisville leaves the gate
23 h 32 apart on the timetable, overnight
DL 5679 leaves 23 h 32 after AA 4391 arrives on the timetable: more than half a day, so not a connection we count.