UA 4617 then CA 3174 at O'Hare
Tulsa → Chicago → Guangzhou
Timetable, Chicago time
20:29UA 4617 from Tulsa at the gate
17:25CA 3174 to Guangzhou leaves the gate
20 h 56 apart on the timetable, overnight
CA 3174 leaves 20 h 56 after UA 4617 arrives on the timetable: more than half a day, so not a connection we count.