DL 965 then DL 2339 at Atlanta
Detroit → Atlanta → Houston
Timetable, Atlanta time
10:29DL 965 from Detroit at the gate
16:40DL 2339 to Houston leaves the gate
6 h 11 apart on the timetable
The last days
DL 965 and DL 2339 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.