AA 3512 then AA 2143 at O'Hare
Cedar Rapids → Chicago → Boston
Timetable, Chicago time
06:29AA 3512 from Cedar Rapids at the gate
08:06AA 2143 to Boston leaves the gate
1 h 37 apart on the timetable
The last days
AA 3512 and AA 2143 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.