DL 5731 then DL 703 at Boston
Pittsburgh → Boston → Washington National
Timetable, Boston time
18:44DL 5731 from Pittsburgh at the gate
18:00DL 703 to Washington National leaves the gate
23 h 16 apart on the timetable, overnight
DL 703 leaves 23 h 16 after DL 5731 arrives on the timetable: more than half a day, so not a connection we count.