AA 1878 then DL 9969 at Salt Lake City
Dallas-Fort Worth → Salt Lake City → Los Angeles
Timetable, Salt Lake City time
10:30AA 1878 from Dallas-Fort Worth at the gate
19:30DL 9969 to Los Angeles leaves the gate
9 h apart on the timetable
The last days
AA 1878 and DL 9969 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.