DL 2990 then DL 2398 at Atlanta
Jacksonville → Atlanta → New York JFK
Timetable, Atlanta time
17:23DL 2990 from Jacksonville at the gate
15:16DL 2398 to New York JFK leaves the gate
21 h 53 apart on the timetable, overnight
DL 2398 leaves 21 h 53 after DL 2990 arrives on the timetable: more than half a day, so not a connection we count.