DL 3802 then DL 474 at Seattle
Portland (Oregon) → Seattle → Boston
Timetable, Seattle time
15:25DL 3802 from Portland (Oregon) at the gate
13:40DL 474 to Boston leaves the gate
22 h 15 apart on the timetable, overnight
DL 474 leaves 22 h 15 after DL 3802 arrives on the timetable: more than half a day, so not a connection we count.