DL 5600 then DL 5679 at Boston
Washington National → Boston → Louisville
Timetable, Boston time
17:11DL 5600 from Washington National at the gate
09:55DL 5679 to Louisville leaves the gate
16 h 44 apart on the timetable, overnight
DL 5679 leaves 16 h 44 after DL 5600 arrives on the timetable: more than half a day, so not a connection we count.