AA 1938 then CZ 438 at O'Hare
Dallas-Fort Worth → Chicago → Shanghai
Timetable, Chicago time
07:35AA 1938 from Dallas-Fort Worth at the gate
01:45CZ 438 to Shanghai leaves the gate
18 h 10 apart on the timetable, overnight
CZ 438 leaves 18 h 10 after AA 1938 arrives on the timetable: more than half a day, so not a connection we count.