AA 1256 then AA 5240 at Charlotte
Buffalo → Charlotte → South Bend
Timetable, Charlotte time
21:39AA 1256 from Buffalo at the gate
21:35AA 5240 to South Bend leaves the gate
23 h 56 apart on the timetable, overnight
AA 5240 leaves 23 h 56 after AA 1256 arrives on the timetable: more than half a day, so not a connection we count.