DL 5615 then DL 5837 at Boston
Louisville → Boston → Charlotte
Timetable, Boston time
16:01DL 5615 from Louisville at the gate
15:10DL 5837 to Charlotte leaves the gate
23 h 09 apart on the timetable, overnight
DL 5837 leaves 23 h 09 after DL 5615 arrives on the timetable: more than half a day, so not a connection we count.