BR 646 then CZ 2502 at O'Hare
Anchorage → Chicago → Shanghai
Timetable, Chicago time
17:10BR 646 from Anchorage at the gate
13:55CZ 2502 to Shanghai leaves the gate
20 h 45 apart on the timetable, overnight
CZ 2502 leaves 20 h 45 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.