DL 5710 then DL 5845 at Boston
Washington National → Boston → Philadelphia
Timetable, Boston time
07:38DL 5710 from Washington National at the gate
06:40DL 5845 to Philadelphia leaves the gate
23 h 02 apart on the timetable, overnight
DL 5845 leaves 23 h 02 after DL 5710 arrives on the timetable: more than half a day, so not a connection we count.