B6 916 then DL 5837 at Boston
Buffalo → Boston → Charlotte
Timetable, Boston time
15:58B6 916 from Buffalo at the gate
15:10DL 5837 to Charlotte leaves the gate
23 h 12 apart on the timetable, overnight
DL 5837 leaves 23 h 12 after B6 916 arrives on the timetable: more than half a day, so not a connection we count.