AA 4527 then CA 8412 at O'Hare
Baltimore → Chicago → Shanghai
Timetable, Chicago time
20:17AA 4527 from Baltimore at the gate
02:55CA 8412 to Shanghai leaves the gate
6 h 38 apart on the timetable, overnight
The last days
AA 4527 and CA 8412 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.