UA 471 then DL 5227 at Atlanta
Washington → Atlanta → Roanoke
Timetable, Atlanta time
14:36UA 471 from Washington at the gate
13:23DL 5227 to Roanoke leaves the gate
22 h 47 apart on the timetable, overnight
DL 5227 leaves 22 h 47 after UA 471 arrives on the timetable: more than half a day, so not a connection we count.