AA 3263 then UA 3881 at Houston
Miami → Houston → Chicago
Timetable, Houston time
11:53AA 3263 from Miami at the gate
22:00UA 3881 to Chicago leaves the gate
10 h 07 apart on the timetable
The last days
AA 3263 and UA 3881 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.