UA 733 then UA 877 at San Francisco
Arcata → San Francisco → Hong Kong
Timetable, San Francisco time
07:18UA 733 from Arcata at the gate
23:15UA 877 to Hong Kong leaves the gate
15 h 57 apart on the timetable
UA 877 leaves 15 h 57 after UA 733 arrives on the timetable: more than half a day, so not a connection we count.