UA 4441 then CA 3174 at O'Hare
Dayton → Chicago → Guangzhou
Timetable, Chicago time
18:43UA 4441 from Dayton at the gate
13:40CA 3174 to Guangzhou leaves the gate
18 h 57 apart on the timetable, overnight
CA 3174 leaves 18 h 57 after UA 4441 arrives on the timetable: more than half a day, so not a connection we count.