AA 504 then Y8 7456 at O'Hare
New York LaGuardia → Chicago → Shanghai
Timetable, Chicago time
13:19AA 504 from New York LaGuardia at the gate
01:35Y8 7456 to Shanghai leaves the gate
12 h 16 apart on the timetable, overnight
Y8 7456 leaves 12 h 16 after AA 504 arrives on the timetable: more than half a day, so not a connection we count.