AA 2124 then OO 9915 at O'Hare
Indianapolis → Chicago → Milwaukee
Timetable, Chicago time
06:01AA 2124 from Indianapolis at the gate
13:00OO 9915 to Milwaukee leaves the gate
6 h 59 apart on the timetable
The last days
AA 2124 and OO 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.