AA 1623 then AA 5987 at Charlotte
Denver → Charlotte → Gainesville
Timetable, Charlotte time
12:32AA 1623 from Denver at the gate
12:30AA 5987 to Gainesville leaves the gate
23 h 58 apart on the timetable, overnight
AA 5987 leaves 23 h 58 after AA 1623 arrives on the timetable: more than half a day, so not a connection we count.