DL 1007 then DL 4991 at Atlanta
Washington National → Atlanta → Alexandria
Timetable, Atlanta time
21:41DL 1007 from Washington National at the gate
10:10DL 4991 to Alexandria leaves the gate
12 h 29 apart on the timetable, overnight
DL 4991 leaves 12 h 29 after DL 1007 arrives on the timetable: more than half a day, so not a connection we count.