AA 4009 then AA 1537 at Phoenix
Redmond → Phoenix → San Diego
Timetable, Phoenix time
14:35AA 4009 from Redmond at the gate
20:45AA 1537 to San Diego leaves the gate
6 h 10 apart on the timetable
The last days
AA 4009 and AA 1537 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.