DL 2175 then DL 903 at Atlanta
Washington National → Atlanta → Seattle
Timetable, Atlanta time
08:56DL 2175 from Washington National at the gate
21:20DL 903 to Seattle leaves the gate
12 h 24 apart on the timetable
DL 903 leaves 12 h 24 after DL 2175 arrives on the timetable: more than half a day, so not a connection we count.