AA 4657 then DL 508 at Boston
Washington National → Boston → Los Angeles
Timetable, Boston time
16:47AA 4657 from Washington National at the gate
16:20DL 508 to Los Angeles leaves the gate
23 h 33 apart on the timetable, overnight
DL 508 leaves 23 h 33 after AA 4657 arrives on the timetable: more than half a day, so not a connection we count.