AA 2748 then CA 3174 at O'Hare
Las Vegas → Chicago → Guangzhou
Timetable, Chicago time
20:07AA 2748 from Las Vegas at the gate
13:40CA 3174 to Guangzhou leaves the gate
17 h 33 apart on the timetable, overnight
CA 3174 leaves 17 h 33 after AA 2748 arrives on the timetable: more than half a day, so not a connection we count.