DL 2804 then CZ 436 at O'Hare
Boston → Chicago → Shanghai
Timetable, Chicago time
21:51DL 2804 from Boston at the gate
19:25CZ 436 to Shanghai leaves the gate
21 h 34 apart on the timetable, overnight
CZ 436 leaves 21 h 34 after DL 2804 arrives on the timetable: more than half a day, so not a connection we count.