DL 175 then DL 2398 at Atlanta
Milan → Atlanta → New York JFK
Timetable, Atlanta time
17:45DL 175 from Milan at the gate
15:16DL 2398 to New York JFK leaves the gate
21 h 31 apart on the timetable, overnight
DL 2398 leaves 21 h 31 after DL 175 arrives on the timetable: more than half a day, so not a connection we count.