DL 196 then DL 438 at Seattle
Seoul → Seattle → Boston
Timetable, Seattle time
11:51DL 196 from Seoul at the gate
11:45DL 438 to Boston leaves the gate
23 h 54 apart on the timetable, overnight
DL 438 leaves 23 h 54 after DL 196 arrives on the timetable: more than half a day, so not a connection we count.