AA 451 then AA 1939 at Phoenix
Cleveland → Phoenix → Austin
Timetable, Phoenix time
09:33AA 451 from Cleveland at the gate
16:29AA 1939 to Austin leaves the gate
6 h 56 apart on the timetable
The last days
AA 451 and AA 1939 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.