AA 4993 then CZ 436 at O'Hare
Milwaukee → Chicago → Shanghai
Timetable, Chicago time
06:24AA 4993 from Milwaukee at the gate
00:45CZ 436 to Shanghai leaves the gate
18 h 21 apart on the timetable, overnight
CZ 436 leaves 18 h 21 after AA 4993 arrives on the timetable: more than half a day, so not a connection we count.