DL 706 then WN 170 at Atlanta
Denver → Atlanta → Washington National
Timetable, Atlanta time
18:01DL 706 from Denver at the gate
15:15WN 170 to Washington National leaves the gate
21 h 14 apart on the timetable, overnight
WN 170 leaves 21 h 14 after DL 706 arrives on the timetable: more than half a day, so not a connection we count.