DL 3876 then WN 406 at Denver
Austin → Denver → Las Vegas
Timetable, Denver time
12:06DL 3876 from Austin at the gate
12:05WN 406 to Las Vegas leaves the gate
23 h 59 apart on the timetable, overnight
WN 406 leaves 23 h 59 after DL 3876 arrives on the timetable: more than half a day, so not a connection we count.