UA 3901 then AS 9921 at San Francisco
Hong Kong → San Francisco → Honolulu
Timetable, San Francisco time
16:34UA 3901 from Hong Kong at the gate
17:00AS 9921 to Honolulu leaves the gate
26 min apart on the timetable
The last days
UA 3901 and AS 9921 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.