AA 3399 then AA 1594 at Phoenix
Monterrey → Phoenix → Austin
Timetable, Phoenix time
19:33AA 3399 from Monterrey at the gate
13:58AA 1594 to Austin leaves the gate
18 h 25 apart on the timetable, overnight
AA 1594 leaves 18 h 25 after AA 3399 arrives on the timetable: more than half a day, so not a connection we count.