AA 3347 then AA 3748 at Boston
Buffalo → Boston → Washington National
Timetable, Boston time
17:50AA 3347 from Buffalo at the gate
07:30AA 3748 to Washington National leaves the gate
13 h 40 apart on the timetable, overnight
AA 3748 leaves 13 h 40 after AA 3347 arrives on the timetable: more than half a day, so not a connection we count.