AA 646 then AA 1594 at Phoenix
Lagos → Phoenix → Austin
Timetable, Phoenix time
17:02AA 646 from Lagos at the gate
13:58AA 1594 to Austin leaves the gate
20 h 56 apart on the timetable, overnight
AA 1594 leaves 20 h 56 after AA 646 arrives on the timetable: more than half a day, so not a connection we count.