DL 921 then DL 2398 at Atlanta
Dallas-Fort Worth → Atlanta → New York JFK
Timetable, Atlanta time
19:29DL 921 from Dallas-Fort Worth at the gate
15:16DL 2398 to New York JFK leaves the gate
19 h 47 apart on the timetable, overnight
DL 2398 leaves 19 h 47 after DL 921 arrives on the timetable: more than half a day, so not a connection we count.