AA 9909 then UA 6061 at Denver
Los Angeles → Denver → St George
Timetable, Denver time
16:45AA 9909 from Los Angeles at the gate
16:25UA 6061 to St George leaves the gate
23 h 40 apart on the timetable, overnight
UA 6061 leaves 23 h 40 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.