UA 312 then CA 3174 at O'Hare
Pittsburgh → Chicago → Guangzhou
Timetable, Chicago time
18:49UA 312 from Pittsburgh at the gate
13:40CA 3174 to Guangzhou leaves the gate
18 h 51 apart on the timetable, overnight
CA 3174 leaves 18 h 51 after UA 312 arrives on the timetable: more than half a day, so not a connection we count.