DL 1007 then DL 4709 at Atlanta
Washington National → Atlanta → Springfield
Timetable, Atlanta time
21:41DL 1007 from Washington National at the gate
15:49DL 4709 to Springfield leaves the gate
18 h 08 apart on the timetable, overnight
DL 4709 leaves 18 h 08 after DL 1007 arrives on the timetable: more than half a day, so not a connection we count.