DL 926 then DL 2020 at Atlanta
Washington National → Atlanta → Oklahoma City
Timetable, Atlanta time
12:09DL 926 from Washington National at the gate
11:20DL 2020 to Oklahoma City leaves the gate
23 h 11 apart on the timetable, overnight
DL 2020 leaves 23 h 11 after DL 926 arrives on the timetable: more than half a day, so not a connection we count.