AA 2550 then CZ 2502 at O'Hare
Dallas-Fort Worth → Chicago → Shanghai
Timetable, Chicago time
07:34AA 2550 from Dallas-Fort Worth at the gate
20:50CZ 2502 to Shanghai leaves the gate
13 h 16 apart on the timetable
CZ 2502 leaves 13 h 16 after AA 2550 arrives on the timetable: more than half a day, so not a connection we count.