AA 2776 then AA 547 at Boston
Charlotte → Boston → Chicago O'Hare
Timetable, Boston time
11:22AA 2776 from Charlotte at the gate
13:25AA 547 to Chicago O'Hare leaves the gate
2 h 03 apart on the timetable
Boston’s board gives an arrival time for only about 58% of its flights, so many days show no gate time.
The last days
AA 2776 and AA 547 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.