AA 1731 then AS 2459 at San Francisco
Dallas-Fort Worth → San Francisco → San Diego
Timetable, San Francisco time
15:10AA 1731 from Dallas-Fort Worth at the gatealso QR 2239, QR 2719, QF 4747
20:00AS 2459 to San Diego leaves the gatealso QR 8803, AA 9319
4 h 50 apart on the timetable
The last days
AA 1731 and AS 2459 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.