DL 3913 then AS 460 at Seattle
Portland (Oregon) → Seattle → Boston
Timetable, Seattle time
20:50DL 3913 from Portland (Oregon) at the gate
15:36AS 460 to Boston leaves the gate
18 h 46 apart on the timetable, overnight
AS 460 leaves 18 h 46 after DL 3913 arrives on the timetable: more than half a day, so not a connection we count.