AA 3303 then AA 3322 at Houston
Philadelphia → Houston → Chicago
Timetable, Houston time
11:54AA 3303 from Philadelphia at the gate
14:41AA 3322 to Chicago leaves the gate
2 h 47 apart on the timetable
The last days
AA 3303 and AA 3322 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.