AA 678 then AA 3217 at Miami
Washington National → Miami → Atlanta
Timetable, Miami time
23:38AA 678 from Washington National at the gate
19:20AA 3217 to Atlanta leaves the gate
19 h 42 apart on the timetable, overnight
AA 3217 leaves 19 h 42 after AA 678 arrives on the timetable: more than half a day, so not a connection we count.