DL 1940 then DL 3828 at Salt Lake City
Chicago O'Hare → Salt Lake City → Billings
Timetable, Salt Lake City time
16:40DL 1940 from Chicago O'Hare at the gate
16:20DL 3828 to Billings leaves the gate
23 h 40 apart on the timetable, overnight
DL 3828 leaves 23 h 40 after DL 1940 arrives on the timetable: more than half a day, so not a connection we count.