ZG 15 then TW 250 at Narita
Houston → Tokyo → Seoul
Timetable, Tokyo time
15:05ZG 15 from Houston at the gate
08:55TW 250 to Seoul leaves the gate
17 h 50 apart on the timetable, overnight
TW 250 leaves 17 h 50 after ZG 15 arrives on the timetable: more than half a day, so not a connection we count.