UA 5251 then CA 8414 at O'Hare
Washington National → Chicago → Shanghai
Timetable, Chicago time
19:40UA 5251 from Washington National at the gate
08:10CA 8414 to Shanghai leaves the gate
12 h 30 apart on the timetable, overnight
CA 8414 leaves 12 h 30 after UA 5251 arrives on the timetable: more than half a day, so not a connection we count.