DL 9728 then DL 3859 at Salt Lake City
Los Angeles → Salt Lake City → Great Falls
Timetable, Salt Lake City time
12:25DL 9728 from Los Angeles at the gate
10:55DL 3859 to Great Falls leaves the gate
22 h 30 apart on the timetable, overnight
DL 3859 leaves 22 h 30 after DL 9728 arrives on the timetable: more than half a day, so not a connection we count.