AA 3178 then CA 3104 at O'Hare
Charlotte → Chicago → Shanghai
Timetable, Chicago time
17:38AA 3178 from Charlotte at the gate
17:40CA 3104 to Shanghai leaves the gate
2 min apart on the timetable
The last days
AA 3178 and CA 3104 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.