AA 4103 then CA 1012 at O'Hare
Detroit → Chicago → Shanghai
Timetable, Chicago time
11:00AA 4103 from Detroit at the gate
21:20CA 1012 to Shanghai leaves the gate
10 h 20 apart on the timetable
The last days
AA 4103 and CA 1012 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.