AA 4178 then AA 2640 at Charlotte
Savannah → Charlotte → Austin
Timetable, Charlotte time
14:35AA 4178 from Savannah at the gate
14:15AA 2640 to Austin leaves the gate
23 h 40 apart on the timetable, overnight
AA 2640 leaves 23 h 40 after AA 4178 arrives on the timetable: more than half a day, so not a connection we count.