DL 609 then DL 4991 at Atlanta
Cancún → Atlanta → Alexandria
Timetable, Atlanta time
10:55DL 609 from Cancún at the gate
10:10DL 4991 to Alexandria leaves the gate
23 h 15 apart on the timetable, overnight
DL 4991 leaves 23 h 15 after DL 609 arrives on the timetable: more than half a day, so not a connection we count.