AA 3420 then CA 3174 at O'Hare
Omaha → Chicago → Guangzhou
Timetable, Chicago time
22:00AA 3420 from Omaha at the gate
13:40CA 3174 to Guangzhou leaves the gate
15 h 40 apart on the timetable, overnight
CA 3174 leaves 15 h 40 after AA 3420 arrives on the timetable: more than half a day, so not a connection we count.