UA 471 then DL 472 at Atlanta
Washington → Atlanta → Seattle
Timetable, Atlanta time
14:36UA 471 from Washington at the gate
14:05DL 472 to Seattle leaves the gate
23 h 29 apart on the timetable, overnight
DL 472 leaves 23 h 29 after UA 471 arrives on the timetable: more than half a day, so not a connection we count.