5A 623 then DL 1723 at Salt Lake City
Idaho Falls → Salt Lake City → Missoula
Timetable, Salt Lake City time
10:005A 623 from Idaho Falls at the gate
22:55DL 1723 to Missoula leaves the gate
12 h 55 apart on the timetable
DL 1723 leaves 12 h 55 after 5A 623 arrives on the timetable: more than half a day, so not a connection we count.