AA 3733 then UA 5210 at O'Hare
Kansas City → Chicago → Detroit
Timetable, Chicago time
09:05AA 3733 from Kansas City at the gate
13:00UA 5210 to Detroit leaves the gate
3 h 55 apart on the timetable
The last days
AA 3733 and UA 5210 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.