DL 1007 then DL 1588 at Atlanta
Washington National → Atlanta → Miami
Timetable, Atlanta time
21:41DL 1007 from Washington National at the gate
18:59DL 1588 to Miami leaves the gate
21 h 18 apart on the timetable, overnight
DL 1588 leaves 21 h 18 after DL 1007 arrives on the timetable: more than half a day, so not a connection we count.