AA 2745 then CA 8414 at O'Hare
Las Vegas → Chicago → Shanghai
Timetable, Chicago time
23:35AA 2745 from Las Vegas at the gate
20:45CA 8414 to Shanghai leaves the gate
21 h 10 apart on the timetable, overnight
CA 8414 leaves 21 h 10 after AA 2745 arrives on the timetable: more than half a day, so not a connection we count.