AA 6256 then CA 3174 at O'Hare
Sioux Falls → Chicago → Guangzhou
Timetable, Chicago time
21:30AA 6256 from Sioux Falls at the gate
13:40CA 3174 to Guangzhou leaves the gate
16 h 10 apart on the timetable, overnight
CA 3174 leaves 16 h 10 after AA 6256 arrives on the timetable: more than half a day, so not a connection we count.