AA 9909 then WN 1277 at Denver
Los Angeles → Denver → Salt Lake City
Timetable, Denver time
16:45AA 9909 from Los Angeles at the gate
19:35WN 1277 to Salt Lake City leaves the gate
2 h 50 apart on the timetable
The last days
AA 9909 and WN 1277 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.