DL 5668 then DL 5679 at Boston
Baltimore → Boston → Louisville
Timetable, Boston time
15:20DL 5668 from Baltimore at the gate
09:55DL 5679 to Louisville leaves the gate
18 h 35 apart on the timetable, overnight
DL 5679 leaves 18 h 35 after DL 5668 arrives on the timetable: more than half a day, so not a connection we count.