AC 4121 then UA 869 at San Francisco
Ontario → San Francisco → Hong Kong
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gate
11:45UA 869 to Hong Kong leaves the gate
17 h 55 apart on the timetable, overnight
UA 869 leaves 17 h 55 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.