F9 4405 then DL 2398 at Atlanta
Miami → Atlanta → New York JFK
Timetable, Atlanta time
18:30F9 4405 from Miami at the gate
15:16DL 2398 to New York JFK leaves the gate
20 h 46 apart on the timetable, overnight
DL 2398 leaves 20 h 46 after F9 4405 arrives on the timetable: more than half a day, so not a connection we count.