AA 4537 then CA 3174 at O'Hare
San Antonio → Chicago → Guangzhou
Timetable, Chicago time
21:53AA 4537 from San Antonio at the gate
13:40CA 3174 to Guangzhou leaves the gate
15 h 47 apart on the timetable, overnight
CA 3174 leaves 15 h 47 after AA 4537 arrives on the timetable: more than half a day, so not a connection we count.