UA 3901 then AS 1867 at San Francisco
Hong Kong → San Francisco → Portland (Oregon)
Timetable, San Francisco time
16:34UA 3901 from Hong Kong at the gate
09:03AS 1867 to Portland (Oregon) leaves the gatealso QR 2984
16 h 29 apart on the timetable, overnight
AS 1867 leaves 16 h 29 after UA 3901 arrives on the timetable: more than half a day, so not a connection we count.