AA 1816 then DL 5630 at Charlotte
Key West → Charlotte → Boston
Timetable, Charlotte time
14:50AA 1816 from Key West at the gate
14:37DL 5630 to Boston leaves the gate
23 h 47 apart on the timetable, overnight
DL 5630 leaves 23 h 47 after AA 1816 arrives on the timetable: more than half a day, so not a connection we count.