DL 188 then DL 2398 at Atlanta
Seoul → Atlanta → New York JFK
Timetable, Atlanta time
17:10DL 188 from Seoul at the gate
15:16DL 2398 to New York JFK leaves the gate
22 h 06 apart on the timetable, overnight
DL 2398 leaves 22 h 06 after DL 188 arrives on the timetable: more than half a day, so not a connection we count.