K4 550 then VN 311 at Narita
Chicago → Tokyo → Hanoi
Timetable, Tokyo time
11:59K4 550 from Chicago at the gate
09:30VN 311 to Hanoi leaves the gate
21 h 31 apart on the timetable, overnight
VN 311 leaves 21 h 31 after K4 550 arrives on the timetable: more than half a day, so not a connection we count.