DL 5121 then DL 1309 at Atlanta
White Plains → Atlanta → Washington
Timetable, Atlanta time
18:50DL 5121 from White Plains at the gate
18:30DL 1309 to Washington leaves the gate
23 h 40 apart on the timetable, overnight
DL 1309 leaves 23 h 40 after DL 5121 arrives on the timetable: more than half a day, so not a connection we count.