BA 297 then CZ 438 at O'Hare
London → Chicago → Shanghai
Timetable, Chicago time
18:45BA 297 from London at the gate
17:20CZ 438 to Shanghai leaves the gate
22 h 35 apart on the timetable, overnight
CZ 438 leaves 22 h 35 after BA 297 arrives on the timetable: more than half a day, so not a connection we count.