AA 9909 then UA 545 at O'Hare
Milwaukee → Chicago → Kansas City
Timetable, Chicago time
09:00AA 9909 from Milwaukee at the gate
14:10UA 545 to Kansas City leaves the gate
5 h 10 apart on the timetable
The last days
AA 9909 and UA 545 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.