B6 1860 then AA 3748 at Boston
Philadelphia → Boston → Washington National
Timetable, Boston time
17:25B6 1860 from Philadelphia at the gate
07:30AA 3748 to Washington National leaves the gate
14 h 05 apart on the timetable, overnight
AA 3748 leaves 14 h 05 after B6 1860 arrives on the timetable: more than half a day, so not a connection we count.