AA 4425 then DL 5679 at Boston
Buffalo → Boston → Louisville
Timetable, Boston time
13:43AA 4425 from Buffalo at the gate
09:55DL 5679 to Louisville leaves the gate
20 h 12 apart on the timetable, overnight
DL 5679 leaves 20 h 12 after AA 4425 arrives on the timetable: more than half a day, so not a connection we count.