DL 748 then DL 2398 at Atlanta
Las Vegas → Atlanta → New York JFK
Timetable, Atlanta time
19:24DL 748 from Las Vegas at the gate
15:16DL 2398 to New York JFK leaves the gate
19 h 52 apart on the timetable, overnight
DL 2398 leaves 19 h 52 after DL 748 arrives on the timetable: more than half a day, so not a connection we count.