UA 142 then WN 406 at Denver
Tokyo → Denver → Las Vegas
Timetable, Denver time
12:15UA 142 from Tokyo at the gate
12:05WN 406 to Las Vegas leaves the gate
23 h 50 apart on the timetable, overnight
WN 406 leaves 23 h 50 after UA 142 arrives on the timetable: more than half a day, so not a connection we count.