AA 547 then AA 4494 at O'Hare
Boston → Chicago → Harrisburg
Timetable, Chicago time
15:29AA 547 from Boston at the gate
16:20AA 4494 to Harrisburg leaves the gate
51 min apart on the timetable
The last days
AA 547 and AA 4494 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.