AA 353 then AA 2743 at Miami
Boston → Miami → Washington National
Timetable, Miami time
18:30AA 353 from Boston at the gate
18:20AA 2743 to Washington National leaves the gate
23 h 50 apart on the timetable, overnight
AA 2743 leaves 23 h 50 after AA 353 arrives on the timetable: more than half a day, so not a connection we count.