DL 1248 then DL 2386 at Atlanta
Harrisburg → Atlanta → New York JFK
Timetable, Atlanta time
14:35DL 1248 from Harrisburg at the gate
03:11DL 2386 to New York JFK leaves the gate
12 h 36 apart on the timetable, overnight
DL 2386 leaves 12 h 36 after DL 1248 arrives on the timetable: more than half a day, so not a connection we count.