UA 751 then CK 626 at O'Hare
Charlotte → Chicago → Shanghai
Timetable, Chicago time
07:25UA 751 from Charlotte at the gate
00:01CK 626 to Shanghai leaves the gate
16 h 36 apart on the timetable, overnight
CK 626 leaves 16 h 36 after UA 751 arrives on the timetable: more than half a day, so not a connection we count.