DL 110 then DL 8789 at Atlanta
Buenos Aires → Atlanta → Detroit
Timetable, Atlanta time
05:55DL 110 from Buenos Aires at the gate
12:15DL 8789 to Detroit leaves the gate
6 h 20 apart on the timetable
The last days
DL 110 and DL 8789 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.