AA 2489 then UA 3774 at O'Hare
Baltimore → Chicago → Kansas City
Timetable, Chicago time
08:45AA 2489 from Baltimore at the gate
12:15UA 3774 to Kansas City leaves the gate
3 h 30 apart on the timetable
The last days
AA 2489 and UA 3774 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.