AC 3997 then AS 9921 at San Francisco
Boise → San Francisco → Honolulu
Timetable, San Francisco time
09:23AC 3997 from Boise at the gatealso UA 4639, NH 7335
17:00AS 9921 to Honolulu leaves the gate
7 h 37 apart on the timetable
The last days
AC 3997 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.