AA 3987 then AA 5670 at Charlotte
Springfield → Charlotte → Lexington
Timetable, Charlotte time
15:38AA 3987 from Springfield at the gate
14:49AA 5670 to Lexington leaves the gate
23 h 11 apart on the timetable, overnight
AA 5670 leaves 23 h 11 after AA 3987 arrives on the timetable: more than half a day, so not a connection we count.