DL 5592 then DL 445 at Boston
Washington National → Boston → Salt Lake City
Timetable, Boston time
16:18DL 5592 from Washington National at the gate
16:15DL 445 to Salt Lake City leaves the gate
23 h 57 apart on the timetable, overnight
DL 445 leaves 23 h 57 after DL 5592 arrives on the timetable: more than half a day, so not a connection we count.