AA 547 then UA 3751 at O'Hare
Boston → Chicago → Cedar Rapids
Timetable, Chicago time
15:29AA 547 from Boston at the gate
20:10UA 3751 to Cedar Rapids leaves the gate
4 h 41 apart on the timetable
The last days
AA 547 and UA 3751 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.