DL 1007 then DL 1554 at Atlanta
Washington National → Atlanta → Washington
Timetable, Atlanta time
21:41DL 1007 from Washington National at the gate
15:27DL 1554 to Washington leaves the gate
17 h 46 apart on the timetable, overnight
DL 1554 leaves 17 h 46 after DL 1007 arrives on the timetable: more than half a day, so not a connection we count.