DL 3802 then DL 281 at Seattle
Portland (Oregon) → Seattle → Shanghai
Timetable, Seattle time
15:25DL 3802 from Portland (Oregon) at the gate
14:40DL 281 to Shanghai leaves the gate
23 h 15 apart on the timetable, overnight
DL 281 leaves 23 h 15 after DL 3802 arrives on the timetable: more than half a day, so not a connection we count.