UA 482 then CZ 2502 at O'Hare
Philadelphia → Chicago → Shanghai
Timetable, Chicago time
07:50UA 482 from Philadelphia at the gate
01:45CZ 2502 to Shanghai leaves the gate
17 h 55 apart on the timetable, overnight
CZ 2502 leaves 17 h 55 after UA 482 arrives on the timetable: more than half a day, so not a connection we count.