WN 1590 then AA 3748 at Boston
Baltimore → Boston → Washington National
Timetable, Boston time
15:50WN 1590 from Baltimore at the gate
07:30AA 3748 to Washington National leaves the gate
15 h 40 apart on the timetable, overnight
AA 3748 leaves 15 h 40 after WN 1590 arrives on the timetable: more than half a day, so not a connection we count.