F9 3136 then CZ 2508 at O'Hare
Houston → Chicago → Guangzhou
Timetable, Chicago time
19:59F9 3136 from Houston at the gate
19:50CZ 2508 to Guangzhou leaves the gate
23 h 51 apart on the timetable, overnight
CZ 2508 leaves 23 h 51 after F9 3136 arrives on the timetable: more than half a day, so not a connection we count.