AA 12 then AA 2461 at Boston
Los Angeles → Boston → Chicago O'Hare
Timetable, Boston time
16:37AA 12 from Los Angeles at the gate
17:58AA 2461 to Chicago O'Hare leaves the gate
1 h 21 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 12 and AA 2461 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.