AA 9950 then CZ 2502 at O'Hare
Charlotte → Chicago → Shanghai
Timetable, Chicago time
08:30AA 9950 from Charlotte at the gate
20:50CZ 2502 to Shanghai leaves the gate
12 h 20 apart on the timetable
CZ 2502 leaves 12 h 20 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.