DL 2847 then DL 5859 at JFK
New Orleans → New York → Washington National
Timetable, New York time
15:27DL 2847 from New Orleans at the gate
15:00DL 5859 to Washington National leaves the gate
23 h 33 apart on the timetable, overnight
DL 5859 leaves 23 h 33 after DL 2847 arrives on the timetable: more than half a day, so not a connection we count.