DL 5699 then DL 5595 at JFK
Washington National → New York → Washington
Timetable, New York time
12:30DL 5699 from Washington National at the gate
10:25DL 5595 to Washington leaves the gate
21 h 55 apart on the timetable, overnight
DL 5595 leaves 21 h 55 after DL 5699 arrives on the timetable: more than half a day, so not a connection we count.