DL 1697 then DL 5857 at Boston
Phoenix → Boston → Washington National
Timetable, Boston time
21:00DL 1697 from Phoenix at the gate
12:49DL 5857 to Washington National leaves the gate
15 h 49 apart on the timetable, overnight
DL 5857 leaves 15 h 49 after DL 1697 arrives on the timetable: more than half a day, so not a connection we count.