AA 3649 then AA 1762 at Phoenix
Tucson → Phoenix → Denver
Timetable, Phoenix time
09:45AA 3649 from Tucson at the gate
16:15AA 1762 to Denver leaves the gate
6 h 30 apart on the timetable
The last days
AA 3649 and AA 1762 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.