UA 291 then CA 3174 at O'Hare
Savannah → Chicago → Guangzhou
Timetable, Chicago time
18:29UA 291 from Savannah at the gate
13:40CA 3174 to Guangzhou leaves the gate
19 h 11 apart on the timetable, overnight
CA 3174 leaves 19 h 11 after UA 291 arrives on the timetable: more than half a day, so not a connection we count.