AA 3585 then AA 2151 at O'Hare
Key West → Chicago → Nashville
Timetable, Chicago time
21:30AA 3585 from Key West at the gate
21:10AA 2151 to Nashville leaves the gate
23 h 40 apart on the timetable, overnight
AA 2151 leaves 23 h 40 after AA 3585 arrives on the timetable: more than half a day, so not a connection we count.