AA 3075 then CZ 2502 at O'Hare
Los Angeles → Chicago → Shanghai
Timetable, Chicago time
16:34AA 3075 from Los Angeles at the gate
13:55CZ 2502 to Shanghai leaves the gate
21 h 21 apart on the timetable, overnight
CZ 2502 leaves 21 h 21 after AA 3075 arrives on the timetable: more than half a day, so not a connection we count.