UA 2753 then CA 3174 at O'Hare
Newark → Chicago → Guangzhou
Timetable, Chicago time
21:30UA 2753 from Newark at the gate
17:25CA 3174 to Guangzhou leaves the gate
19 h 55 apart on the timetable, overnight
CA 3174 leaves 19 h 55 after UA 2753 arrives on the timetable: more than half a day, so not a connection we count.