DL 9728 then DL 1553 at Salt Lake City
Los Angeles → Salt Lake City → Denver
Timetable, Salt Lake City time
12:25DL 9728 from Los Angeles at the gate
10:28DL 1553 to Denver leaves the gate
22 h 03 apart on the timetable, overnight
DL 1553 leaves 22 h 03 after DL 9728 arrives on the timetable: more than half a day, so not a connection we count.