DL 5600 then DL 508 at Boston
Washington National → Boston → Los Angeles
Timetable, Boston time
17:11DL 5600 from Washington National at the gate
16:15DL 508 to Los Angeles leaves the gate
23 h 04 apart on the timetable, overnight
DL 508 leaves 23 h 04 after DL 5600 arrives on the timetable: more than half a day, so not a connection we count.