AA 873 then DL 2398 at Atlanta
Chicago O'Hare → Atlanta → New York JFK
Timetable, Atlanta time
10:23AA 873 from Chicago O'Hare at the gate
22:40DL 2398 to New York JFK leaves the gate
12 h 17 apart on the timetable
DL 2398 leaves 12 h 17 after AA 873 arrives on the timetable: more than half a day, so not a connection we count.