DL 2168 then DL 2398 at Atlanta
Key West → Atlanta → New York JFK
Timetable, Atlanta time
20:19DL 2168 from Key West at the gate
15:16DL 2398 to New York JFK leaves the gate
18 h 57 apart on the timetable, overnight
DL 2398 leaves 18 h 57 after DL 2168 arrives on the timetable: more than half a day, so not a connection we count.