AA 2883 then UA 1525 at O'Hare
Salt Lake City → Chicago → Las Vegas
Timetable, Chicago time
11:54AA 2883 from Salt Lake City at the gate
15:06UA 1525 to Las Vegas leaves the gate
3 h 12 apart on the timetable
The last days
AA 2883 and UA 1525 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.