UA 254 then CA 3174 at O'Hare
Newark → Chicago → Guangzhou
Timetable, Chicago time
20:14UA 254 from Newark at the gate
13:40CA 3174 to Guangzhou leaves the gate
17 h 26 apart on the timetable, overnight
CA 3174 leaves 17 h 26 after UA 254 arrives on the timetable: more than half a day, so not a connection we count.