DL 854 then DL 950 at Atlanta
Springfield → Atlanta → Washington National
Timetable, Atlanta time
18:50DL 854 from Springfield at the gate
16:40DL 950 to Washington National leaves the gate
21 h 50 apart on the timetable, overnight
DL 950 leaves 21 h 50 after DL 854 arrives on the timetable: more than half a day, so not a connection we count.