AA 3517 then AA 2748 at O'Hare
Kansas City → Chicago → Las Vegas
Timetable, Chicago time
09:05AA 3517 from Kansas City at the gate
11:00AA 2748 to Las Vegas leaves the gate
1 h 55 apart on the timetable
The last days
AA 3517 and AA 2748 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.