DL 2857 then DL 2398 at Atlanta
Harrisburg → Atlanta → New York JFK
Timetable, Atlanta time
20:34DL 2857 from Harrisburg at the gate
15:16DL 2398 to New York JFK leaves the gate
18 h 42 apart on the timetable, overnight
DL 2398 leaves 18 h 42 after DL 2857 arrives on the timetable: more than half a day, so not a connection we count.