AA 3279 then AA 1843 at Charlotte
New York LaGuardia → Charlotte → Boston
Timetable, Charlotte time
09:25AA 3279 from New York LaGuardia at the gate
21:45AA 1843 to Boston leaves the gate
12 h 20 apart on the timetable
AA 1843 leaves 12 h 20 after AA 3279 arrives on the timetable: more than half a day, so not a connection we count.