DL 175 then DL 1359 at Atlanta
Milan → Atlanta → New Orleans
Timetable, Atlanta time
17:45DL 175 from Milan at the gate
21:49DL 1359 to New Orleans leaves the gate
4 h 04 apart on the timetable
The last days
DL 175 and DL 1359 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.