AA 894 then CZ 2502 at O'Hare
Boston → Chicago → Shanghai
Timetable, Chicago time
14:18AA 894 from Boston at the gate
13:55CZ 2502 to Shanghai leaves the gate
23 h 37 apart on the timetable, overnight
CZ 2502 leaves 23 h 37 after AA 894 arrives on the timetable: more than half a day, so not a connection we count.