UA 654 then AA 555 at Houston
Los Angeles → Houston → Chicago
Timetable, Houston time
11:08UA 654 from Los Angeles at the gate
18:55AA 555 to Chicago leaves the gate
7 h 47 apart on the timetable
The last days
UA 654 and AA 555 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.