AA 2550 then CZ 438 at O'Hare
Dallas-Fort Worth → Chicago → Shanghai
Timetable, Chicago time
07:34AA 2550 from Dallas-Fort Worth at the gate
01:45CZ 438 to Shanghai leaves the gate
18 h 11 apart on the timetable, overnight
CZ 438 leaves 18 h 11 after AA 2550 arrives on the timetable: more than half a day, so not a connection we count.