AA 2748 then Y8 7456 at O'Hare
Las Vegas → Chicago → Shanghai
Timetable, Chicago time
20:07AA 2748 from Las Vegas at the gate
19:10Y8 7456 to Shanghai leaves the gate
23 h 03 apart on the timetable, overnight
Y8 7456 leaves 23 h 03 after AA 2748 arrives on the timetable: more than half a day, so not a connection we count.