AA 3811 then CA 3174 at O'Hare
Omaha → Chicago → Guangzhou
Timetable, Chicago time
17:57AA 3811 from Omaha at the gate
13:40CA 3174 to Guangzhou leaves the gate
19 h 43 apart on the timetable, overnight
CA 3174 leaves 19 h 43 after AA 3811 arrives on the timetable: more than half a day, so not a connection we count.