AA 1256 then AA 2559 at Charlotte
Buffalo → Charlotte → Detroit
Timetable, Charlotte time
21:39AA 1256 from Buffalo at the gate
20:51AA 2559 to Detroit leaves the gate
23 h 12 apart on the timetable, overnight
AA 2559 leaves 23 h 12 after AA 1256 arrives on the timetable: more than half a day, so not a connection we count.