UA 4455 then AA 9786 at O'Hare
Madison → Chicago → Philadelphia
Timetable, Chicago time
14:02UA 4455 from Madison at the gate
17:30AA 9786 to Philadelphia leaves the gate
3 h 28 apart on the timetable
The last days
UA 4455 and AA 9786 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.