AA 3144 then DL 2709 at Houston
Chicago → Houston → Atlanta
Timetable, Houston time
23:57AA 3144 from Chicago at the gate
08:05DL 2709 to Atlanta leaves the gate
8 h 08 apart on the timetable, overnight
The last days
AA 3144 and DL 2709 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.