UA 1664 then CA 3174 at O'Hare
Punta Cana → Chicago → Guangzhou
Timetable, Chicago time
18:10UA 1664 from Punta Cana at the gate
13:40CA 3174 to Guangzhou leaves the gate
19 h 30 apart on the timetable, overnight
CA 3174 leaves 19 h 30 after UA 1664 arrives on the timetable: more than half a day, so not a connection we count.