AA 4726 then AA 3748 at Boston
Indianapolis → Boston → Washington National
Timetable, Boston time
19:16AA 4726 from Indianapolis at the gate
07:30AA 3748 to Washington National leaves the gate
12 h 14 apart on the timetable, overnight
AA 3748 leaves 12 h 14 after AA 4726 arrives on the timetable: more than half a day, so not a connection we count.