AA 5510 then DL 1366 at Atlanta
Washington National → Atlanta → Chattanooga
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
21:29DL 1366 to Chattanooga leaves the gate
22 h 06 apart on the timetable, overnight
DL 1366 leaves 22 h 06 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.