AA 3939 then AA 2386 at Charlotte
Key West → Charlotte → Cedar Rapids
Timetable, Charlotte time
20:52AA 3939 from Key West at the gate
19:40AA 2386 to Cedar Rapids leaves the gate
22 h 48 apart on the timetable, overnight
AA 2386 leaves 22 h 48 after AA 3939 arrives on the timetable: more than half a day, so not a connection we count.