DL 1697 then DL 719 at Boston
Phoenix → Boston → Washington National
Timetable, Boston time
21:00DL 1697 from Phoenix at the gate
09:37DL 719 to Washington National leaves the gate
12 h 37 apart on the timetable, overnight
DL 719 leaves 12 h 37 after DL 1697 arrives on the timetable: more than half a day, so not a connection we count.