DL 1668 then DL 378 at Atlanta
Indianapolis → Atlanta → Washington National
Timetable, Atlanta time
21:54DL 1668 from Indianapolis at the gate
20:59DL 378 to Washington National leaves the gate
23 h 05 apart on the timetable, overnight
DL 378 leaves 23 h 05 after DL 1668 arrives on the timetable: more than half a day, so not a connection we count.