AA 1854 then CZ 2502 at O'Hare
San Francisco → Chicago → Shanghai
Timetable, Chicago time
05:59AA 1854 from San Francisco at the gate
01:45CZ 2502 to Shanghai leaves the gate
19 h 46 apart on the timetable, overnight
CZ 2502 leaves 19 h 46 after AA 1854 arrives on the timetable: more than half a day, so not a connection we count.