DL 8843 then DL 279 at Atlanta
Washington → Atlanta → Buenos Aires
Timetable, Atlanta time
02:39DL 8843 from Washington at the gate
19:55DL 279 to Buenos Aires leaves the gate
17 h 16 apart on the timetable
DL 279 leaves 17 h 16 after DL 8843 arrives on the timetable: more than half a day, so not a connection we count.