UA 2780 then CA 1020 at O'Hare
Los Angeles → Chicago → Shanghai
Timetable, Chicago time
22:59UA 2780 from Los Angeles at the gate
19:30CA 1020 to Shanghai leaves the gate
20 h 31 apart on the timetable, overnight
CA 1020 leaves 20 h 31 after UA 2780 arrives on the timetable: more than half a day, so not a connection we count.