DL 965 then DL 4991 at Atlanta
Detroit → Atlanta → Alexandria
Timetable, Atlanta time
10:30DL 965 from Detroit at the gate
10:10DL 4991 to Alexandria leaves the gate
23 h 40 apart on the timetable, overnight
DL 4991 leaves 23 h 40 after DL 965 arrives on the timetable: more than half a day, so not a connection we count.