DL 1978 then DL 2398 at Atlanta
Santa Clara → Atlanta → New York JFK
Timetable, Atlanta time
19:13DL 1978 from Santa Clara at the gate
15:16DL 2398 to New York JFK leaves the gate
20 h 03 apart on the timetable, overnight
DL 2398 leaves 20 h 03 after DL 1978 arrives on the timetable: more than half a day, so not a connection we count.