AA 4608 then AA 2151 at O'Hare
Memphis → Chicago → Nashville
Timetable, Chicago time
08:59AA 4608 from Memphis at the gate
21:10AA 2151 to Nashville leaves the gate
12 h 11 apart on the timetable
AA 2151 leaves 12 h 11 after AA 4608 arrives on the timetable: more than half a day, so not a connection we count.