DL 3906 then DL 9964 at Seattle
Boise → Seattle → Salt Lake City
Timetable, Seattle time
16:24DL 3906 from Boise at the gate
12:00DL 9964 to Salt Lake City leaves the gate
19 h 36 apart on the timetable, overnight
DL 9964 leaves 19 h 36 after DL 3906 arrives on the timetable: more than half a day, so not a connection we count.