UA 564 then AA 440 at Houston
Cleveland → Houston → Chicago
Timetable, Houston time
08:21UA 564 from Cleveland at the gate
11:42AA 440 to Chicago leaves the gate
3 h 21 apart on the timetable
The last days
UA 564 and AA 440 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.