DL 2956 then DL 2398 at Atlanta
Philadelphia → Atlanta → New York JFK
Timetable, Atlanta time
17:53DL 2956 from Philadelphia at the gate
15:16DL 2398 to New York JFK leaves the gate
21 h 23 apart on the timetable, overnight
DL 2398 leaves 21 h 23 after DL 2956 arrives on the timetable: more than half a day, so not a connection we count.