DL 455 then DL 1481 at Atlanta
Washington National → Atlanta → Louisville
Timetable, Atlanta time
10:56DL 455 from Washington National at the gate
10:35DL 1481 to Louisville leaves the gate
23 h 39 apart on the timetable, overnight
DL 1481 leaves 23 h 39 after DL 455 arrives on the timetable: more than half a day, so not a connection we count.