AA 6451 then UA 4743 at Denver
Los Angeles → Denver → Salt Lake City
Timetable, Denver time
11:21AA 6451 from Los Angeles at the gate
08:00UA 4743 to Salt Lake City leaves the gate
20 h 39 apart on the timetable, overnight
UA 4743 leaves 20 h 39 after AA 6451 arrives on the timetable: more than half a day, so not a connection we count.