AA 2363 then UA 4743 at Denver
Chicago O'Hare → Denver → Salt Lake City
Timetable, Denver time
11:37AA 2363 from Chicago O'Hare at the gate
08:00UA 4743 to Salt Lake City leaves the gate
20 h 23 apart on the timetable, overnight
UA 4743 leaves 20 h 23 after AA 2363 arrives on the timetable: more than half a day, so not a connection we count.