AS 445 then AS 9722 at Seattle
Missoula → Seattle → San Diego
Timetable, Seattle time
07:44AS 445 from Missoula at the gate
16:45AS 9722 to San Diego leaves the gate
9 h 01 apart on the timetable
Seattle’s board gives a departure time for only about 56% of its flights, so many days show no gate time.
The last days
AS 445 and AS 9722 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.