B6 2454 then DL 5630 at Boston
Washington National → Boston → Charlotte
Timetable, Boston time
12:05B6 2454 from Washington National at the gate
11:15DL 5630 to Charlotte leaves the gate
23 h 10 apart on the timetable, overnight
DL 5630 leaves 23 h 10 after B6 2454 arrives on the timetable: more than half a day, so not a connection we count.