AA 3744 then DL 1401 at Boston
Washington National → Boston → Fort Lauderdale
Timetable, Boston time
12:10AA 3744 from Washington National at the gate
07:05DL 1401 to Fort Lauderdale leaves the gate
18 h 55 apart on the timetable, overnight
DL 1401 leaves 18 h 55 after AA 3744 arrives on the timetable: more than half a day, so not a connection we count.