AA 9908 then UA 4590 at O'Hare
Milwaukee → Chicago → Moline
Timetable, Chicago time
08:20AA 9908 from Milwaukee at the gate
12:40UA 4590 to Moline leaves the gate
4 h 20 apart on the timetable
The last days
AA 9908 and UA 4590 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.