DL 5121 then DL 2398 at Atlanta
White Plains → Atlanta → New York JFK
Timetable, Atlanta time
18:50DL 5121 from White Plains at the gate
15:16DL 2398 to New York JFK leaves the gate
20 h 26 apart on the timetable, overnight
DL 2398 leaves 20 h 26 after DL 5121 arrives on the timetable: more than half a day, so not a connection we count.