UA 5451 then CA 3174 at O'Hare
Detroit → Chicago → Guangzhou
Timetable, Chicago time
19:03UA 5451 from Detroit at the gate
13:40CA 3174 to Guangzhou leaves the gate
18 h 37 apart on the timetable, overnight
CA 3174 leaves 18 h 37 after UA 5451 arrives on the timetable: more than half a day, so not a connection we count.