DL 715 then DL 2398 at Atlanta
Los Angeles → Atlanta → New York JFK
Timetable, Atlanta time
21:15DL 715 from Los Angeles at the gate
15:16DL 2398 to New York JFK leaves the gate
18 h 01 apart on the timetable, overnight
DL 2398 leaves 18 h 01 after DL 715 arrives on the timetable: more than half a day, so not a connection we count.