UA 415 then CA 3174 at O'Hare
Milan → Chicago → Guangzhou
Timetable, Chicago time
18:15UA 415 from Milan at the gate
13:40CA 3174 to Guangzhou leaves the gate
19 h 25 apart on the timetable, overnight
CA 3174 leaves 19 h 25 after UA 415 arrives on the timetable: more than half a day, so not a connection we count.