UA 1978 then WN 1666 at Denver
Jackson → Denver → Las Vegas
Timetable, Denver time
08:48UA 1978 from Jackson at the gate
20:50WN 1666 to Las Vegas leaves the gate
12 h 02 apart on the timetable
WN 1666 leaves 12 h 02 after UA 1978 arrives on the timetable: more than half a day, so not a connection we count.