DL 473 then DL 5845 at Boston
Seattle → Boston → Philadelphia
Timetable, Boston time
07:25DL 473 from Seattle at the gate
06:40DL 5845 to Philadelphia leaves the gate
23 h 15 apart on the timetable, overnight
DL 5845 leaves 23 h 15 after DL 473 arrives on the timetable: more than half a day, so not a connection we count.