AA 1741 then UA 3902 at O'Hare
Sacramento → Chicago → Hong Kong
Timetable, Chicago time
05:00AA 1741 from Sacramento at the gate
17:30UA 3902 to Hong Kong leaves the gate
12 h 30 apart on the timetable
UA 3902 leaves 12 h 30 after AA 1741 arrives on the timetable: more than half a day, so not a connection we count.