AA 1731 then TN 1241 at San Francisco
Dallas-Fort Worth → San Francisco → Los Angeles
Timetable, San Francisco time
15:10AA 1731 from Dallas-Fort Worth at the gatealso QR 2239
18:32TN 1241 to Los Angeles leaves the gatealso QF 4730, AA 6440
3 h 22 apart on the timetable
The last days
AA 1731 and TN 1241 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.