DL 1007 then UA 1831 at Atlanta
Washington National → Atlanta → Washington
Timetable, Atlanta time
21:41DL 1007 from Washington National at the gate
14:31UA 1831 to Washington leaves the gate
16 h 50 apart on the timetable, overnight
UA 1831 leaves 16 h 50 after DL 1007 arrives on the timetable: more than half a day, so not a connection we count.