UA 5355 then AA 6422 at Denver
Salt Lake City → Denver → Los Angeles
Timetable, Denver time
12:24UA 5355 from Salt Lake City at the gate
12:17AA 6422 to Los Angeles leaves the gate
23 h 53 apart on the timetable, overnight
AA 6422 leaves 23 h 53 after UA 5355 arrives on the timetable: more than half a day, so not a connection we count.