AA 644 then AA 6353 at Phoenix
Tampa → Phoenix → St George
Timetable, Phoenix time
20:50AA 644 from Tampa at the gate
16:02AA 6353 to St George leaves the gate
19 h 12 apart on the timetable, overnight
AA 6353 leaves 19 h 12 after AA 644 arrives on the timetable: more than half a day, so not a connection we count.