AA 1277 then CA 3174 at O'Hare
Denver → Chicago → Guangzhou
Timetable, Chicago time
18:19AA 1277 from Denver at the gate
13:40CA 3174 to Guangzhou leaves the gate
19 h 21 apart on the timetable, overnight
CA 3174 leaves 19 h 21 after AA 1277 arrives on the timetable: more than half a day, so not a connection we count.