DL 1680 then AA 4576 at Atlanta
Cincinnati → Atlanta → Washington National
Timetable, Atlanta time
21:43DL 1680 from Cincinnati at the gate
13:39AA 4576 to Washington National leaves the gate
15 h 56 apart on the timetable, overnight
AA 4576 leaves 15 h 56 after DL 1680 arrives on the timetable: more than half a day, so not a connection we count.