UA 1978 then UA 4743 at Denver
Jackson → Denver → Salt Lake City
Timetable, Denver time
08:48UA 1978 from Jackson at the gate
08:00UA 4743 to Salt Lake City leaves the gate
23 h 12 apart on the timetable, overnight
UA 4743 leaves 23 h 12 after UA 1978 arrives on the timetable: more than half a day, so not a connection we count.