AA 830 then AA 1232 at Philadelphia
Chicago O'Hare → Philadelphia → Boston
Timetable, Philadelphia time
16:33AA 830 from Chicago O'Hare at the gate
20:12AA 1232 to Boston leaves the gate
3 h 39 apart on the timetable
The last days
AA 830 and AA 1232 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.