AA 4102 then UA 4743 at Denver
Chicago O'Hare → Denver → Salt Lake City
Timetable, Denver time
08:40AA 4102 from Chicago O'Hare at the gate
08:00UA 4743 to Salt Lake City leaves the gate
23 h 20 apart on the timetable, overnight
UA 4743 leaves 23 h 20 after AA 4102 arrives on the timetable: more than half a day, so not a connection we count.