DL 725 then DL 2398 at Atlanta
San Diego → Atlanta → New York JFK
Timetable, Atlanta time
18:13DL 725 from San Diego at the gate
15:16DL 2398 to New York JFK leaves the gate
21 h 03 apart on the timetable, overnight
DL 2398 leaves 21 h 03 after DL 725 arrives on the timetable: more than half a day, so not a connection we count.