DL 1007 then DL 1596 at Atlanta
Washington National → Atlanta → Tri-Cities
Timetable, Atlanta time
21:41DL 1007 from Washington National at the gate
21:23DL 1596 to Tri-Cities leaves the gate
23 h 42 apart on the timetable, overnight
DL 1596 leaves 23 h 42 after DL 1007 arrives on the timetable: more than half a day, so not a connection we count.