CK 225 then CZ 2502 at O'Hare
Seattle (SEA) → Chicago → Shanghai
Timetable, Chicago time
07:42CK 225 from Seattle (SEA) at the gate
01:45CZ 2502 to Shanghai leaves the gate
18 h 03 apart on the timetable, overnight
CZ 2502 leaves 18 h 03 after CK 225 arrives on the timetable: more than half a day, so not a connection we count.