K4 550 then SQ 637 at Narita
Chicago → Tokyo → Singapore
Timetable, Tokyo time
11:59K4 550 from Chicago at the gate
10:00SQ 637 to Singapore leaves the gate
22 h 01 apart on the timetable, overnight
SQ 637 leaves 22 h 01 after K4 550 arrives on the timetable: more than half a day, so not a connection we count.