AA 9919 then WN 585 at Phoenix
Tucson → Phoenix → Denver
Timetable, Phoenix time
12:15AA 9919 from Tucson at the gate
16:10WN 585 to Denver leaves the gate
3 h 55 apart on the timetable
The last days
AA 9919 and WN 585 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.