AA 2810 then QR 2103 at San Francisco
Dallas-Fort Worth → San Francisco → Los Angeles
Timetable, San Francisco time
18:02AA 2810 from Dallas-Fort Worth at the gatealso QF 3234, BA 4359
22:06QR 2103 to Los Angeles leaves the gatealso AS 2415, QR 2982
4 h 04 apart on the timetable
The last days
AA 2810 and QR 2103 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.