DL 777 then DL 2398 at Atlanta
Las Vegas → Atlanta → New York JFK
Timetable, Atlanta time
17:49DL 777 from Las Vegas at the gate
15:16DL 2398 to New York JFK leaves the gate
21 h 27 apart on the timetable, overnight
DL 2398 leaves 21 h 27 after DL 777 arrives on the timetable: more than half a day, so not a connection we count.