AA 2556 then CA 3174 at O'Hare
San Diego → Chicago → Guangzhou
Timetable, Chicago time
19:59AA 2556 from San Diego at the gate
13:40CA 3174 to Guangzhou leaves the gate
17 h 41 apart on the timetable, overnight
CA 3174 leaves 17 h 41 after AA 2556 arrives on the timetable: more than half a day, so not a connection we count.