UA 564 then DL 2403 at Houston
Cleveland → Houston → Atlanta
Timetable, Houston time
08:21UA 564 from Cleveland at the gate
18:19DL 2403 to Atlanta leaves the gate
9 h 58 apart on the timetable
The last days
UA 564 and DL 2403 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.