AA 1812 then CA 3174 at O'Hare
Austin → Chicago → Guangzhou
Timetable, Chicago time
18:59AA 1812 from Austin at the gate
13:40CA 3174 to Guangzhou leaves the gate
18 h 41 apart on the timetable, overnight
CA 3174 leaves 18 h 41 after AA 1812 arrives on the timetable: more than half a day, so not a connection we count.