DL 850 then DL 2398 at Atlanta
Washington National → Atlanta → New York JFK
Timetable, Atlanta time
20:29DL 850 from Washington National at the gate
15:16DL 2398 to New York JFK leaves the gate
18 h 47 apart on the timetable, overnight
DL 2398 leaves 18 h 47 after DL 850 arrives on the timetable: more than half a day, so not a connection we count.