AA 5984 then DL 5630 at Charlotte
Florence → Charlotte → Boston
Timetable, Charlotte time
16:44AA 5984 from Florence at the gate
14:37DL 5630 to Boston leaves the gate
21 h 53 apart on the timetable, overnight
DL 5630 leaves 21 h 53 after AA 5984 arrives on the timetable: more than half a day, so not a connection we count.