DL 82 then DL 1705 at Atlanta
Memphis → Atlanta → Louisville
Timetable, Atlanta time
14:12DL 82 from Memphis at the gate
20:20DL 1705 to Louisville leaves the gate
6 h 08 apart on the timetable
The last days
DL 82 and DL 1705 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.