AA 3962 then DL 3507 at Atlanta
Washington National → Atlanta → Shreveport
Timetable, Atlanta time
13:54AA 3962 from Washington National at the gate
11:00DL 3507 to Shreveport leaves the gate
21 h 06 apart on the timetable, overnight
DL 3507 leaves 21 h 06 after AA 3962 arrives on the timetable: more than half a day, so not a connection we count.