AA 2780 then AA 894 at Boston
Philadelphia → Boston → Chicago O'Hare
Timetable, Boston time
10:25AA 2780 from Philadelphia at the gate
12:12AA 894 to Chicago O'Hare leaves the gate
1 h 47 apart on the timetable
The last days
AA 2780 and AA 894 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.