AA 4963 then AA 2253 at O'Hare
Milwaukee → Chicago → San Francisco
Timetable, Chicago time
10:05AA 4963 from Milwaukee at the gate
13:26AA 2253 to San Francisco leaves the gate
3 h 21 apart on the timetable
The last days
AA 4963 and AA 2253 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.