QF 73 then UA 5489 at San Francisco
Sydney → San Francisco → Arcata
Timetable, San Francisco time
15:55QF 73 from Sydney at the gatealso AS 5001, AA 7397
19:10UA 5489 to Arcata leaves the gate
3 h 15 apart on the timetable
The last days
QF 73 and UA 5489 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.