AA 3409 then AA 9915 at O'Hare
St Louis → Chicago → Milwaukee
Timetable, Chicago time
07:34AA 3409 from St Louis at the gate
11:00AA 9915 to Milwaukee leaves the gate
3 h 26 apart on the timetable
The last days
AA 3409 and AA 9915 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.