AS 3 then DL 3997 at Seattle
Washington National → Seattle → Portland (Oregon)
Timetable, Seattle time
20:13AS 3 from Washington National at the gate
19:35DL 3997 to Portland (Oregon) leaves the gate
23 h 22 apart on the timetable, overnight
DL 3997 leaves 23 h 22 after AS 3 arrives on the timetable: more than half a day, so not a connection we count.