DL 9728 then JL 717 at Salt Lake City
Los Angeles → Salt Lake City → Las Vegas
Timetable, Salt Lake City time
12:25DL 9728 from Los Angeles at the gate
16:30JL 717 to Las Vegas leaves the gate
4 h 05 apart on the timetable
The last days
DL 9728 and JL 717 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.