AS 478 then AA 1594 at Phoenix
Seattle → Phoenix → San Diego
Timetable, Phoenix time
18:00AS 478 from Seattle at the gate
21:40AA 1594 to San Diego leaves the gate
3 h 40 apart on the timetable
The last days
AS 478 and AA 1594 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.