AA 2515 then CA 3174 at O'Hare
Portland (Oregon) → Chicago → Guangzhou
Timetable, Chicago time
19:35AA 2515 from Portland (Oregon) at the gate
13:40CA 3174 to Guangzhou leaves the gate
18 h 05 apart on the timetable, overnight
CA 3174 leaves 18 h 05 after AA 2515 arrives on the timetable: more than half a day, so not a connection we count.