UA 2291 then CA 3174 at O'Hare
Sacramento → Chicago → Guangzhou
Timetable, Chicago time
20:31UA 2291 from Sacramento at the gate
13:40CA 3174 to Guangzhou leaves the gate
17 h 09 apart on the timetable, overnight
CA 3174 leaves 17 h 09 after UA 2291 arrives on the timetable: more than half a day, so not a connection we count.