UA 2784 then CA 3104 at O'Hare
New York LaGuardia → Chicago → Shanghai
Timetable, Chicago time
14:55UA 2784 from New York LaGuardia at the gate
11:40CA 3104 to Shanghai leaves the gate
20 h 45 apart on the timetable, overnight
CA 3104 leaves 20 h 45 after UA 2784 arrives on the timetable: more than half a day, so not a connection we count.