AA 1271 then DL 5648 at Charlotte
Cincinnati → Charlotte → Boston
Timetable, Charlotte time
07:50AA 1271 from Cincinnati at the gate
06:40DL 5648 to Boston leaves the gate
22 h 50 apart on the timetable, overnight
DL 5648 leaves 22 h 50 after AA 1271 arrives on the timetable: more than half a day, so not a connection we count.