DL 2123 then DL 5679 at Boston
Savannah → Boston → Louisville
Timetable, Boston time
14:15DL 2123 from Savannah at the gate
09:55DL 5679 to Louisville leaves the gate
19 h 40 apart on the timetable, overnight
DL 5679 leaves 19 h 40 after DL 2123 arrives on the timetable: more than half a day, so not a connection we count.