DL 1246 then DL 2398 at Atlanta
Milwaukee → Atlanta → New York JFK
Timetable, Atlanta time
18:20DL 1246 from Milwaukee at the gate
15:16DL 2398 to New York JFK leaves the gate
20 h 56 apart on the timetable, overnight
DL 2398 leaves 20 h 56 after DL 1246 arrives on the timetable: more than half a day, so not a connection we count.