AA 644 then AA 1594 at Phoenix
Las Vegas → Phoenix → Austin
Timetable, Phoenix time
15:49AA 644 from Las Vegas at the gate
13:58AA 1594 to Austin leaves the gate
22 h 09 apart on the timetable, overnight
AA 1594 leaves 22 h 09 after AA 644 arrives on the timetable: more than half a day, so not a connection we count.