AA 9909 then UA 2348 at Denver
Los Angeles → Denver → Salt Lake City
Timetable, Denver time
16:45AA 9909 from Los Angeles at the gate
15:45UA 2348 to Salt Lake City leaves the gate
23 h apart on the timetable, overnight
UA 2348 leaves 23 h after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.