AA 3649 then DL 3535 at Phoenix
Tucson → Phoenix → Austin
Timetable, Phoenix time
09:45AA 3649 from Tucson at the gate
10:34DL 3535 to Austin leaves the gate
49 min apart on the timetable
The last days
AA 3649 and DL 3535 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.