AA 3178 then CA 3174 at O'Hare
Charlotte → Chicago → Guangzhou
Timetable, Chicago time
17:40AA 3178 from Charlotte at the gate
13:40CA 3174 to Guangzhou leaves the gate
20 h apart on the timetable, overnight
CA 3174 leaves 20 h after AA 3178 arrives on the timetable: more than half a day, so not a connection we count.