AA 3645 then AA 1594 at Phoenix
Tulsa → Phoenix → Austin
Timetable, Phoenix time
19:20AA 3645 from Tulsa at the gate
13:58AA 1594 to Austin leaves the gate
18 h 38 apart on the timetable, overnight
AA 1594 leaves 18 h 38 after AA 3645 arrives on the timetable: more than half a day, so not a connection we count.