AA 2524 then CZ 438 at O'Hare
San Francisco → Chicago → Shanghai
Timetable, Chicago time
21:38AA 2524 from San Francisco at the gate
18:25CZ 438 to Shanghai leaves the gate
20 h 47 apart on the timetable, overnight
CZ 438 leaves 20 h 47 after AA 2524 arrives on the timetable: more than half a day, so not a connection we count.