UA 3880 then CA 3174 at O'Hare
Chicago → Chicago → Guangzhou
Timetable, Chicago time
20:34UA 3880 from Chicago at the gate
13:40CA 3174 to Guangzhou leaves the gate
17 h 06 apart on the timetable, overnight
CA 3174 leaves 17 h 06 after UA 3880 arrives on the timetable: more than half a day, so not a connection we count.