AA 2178 then AS 2399 at Salt Lake City
Dallas-Fort Worth → Salt Lake City → San Diego
Timetable, Salt Lake City time
10:17AA 2178 from Dallas-Fort Worth at the gate
14:15AS 2399 to San Diego leaves the gate
3 h 58 apart on the timetable
The last days
AA 2178 and AS 2399 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.