AA 1948 then CA 3174 at O'Hare
San Francisco → Chicago → Guangzhou
Timetable, Chicago time
20:55AA 1948 from San Francisco at the gate
13:40CA 3174 to Guangzhou leaves the gate
16 h 45 apart on the timetable, overnight
CA 3174 leaves 16 h 45 after AA 1948 arrives on the timetable: more than half a day, so not a connection we count.