AA 9977 then AA 9781 at Philadelphia
Richmond → Philadelphia → Chicago O'Hare
Timetable, Philadelphia time
13:55AA 9977 from Richmond at the gate
18:00AA 9781 to Chicago O'Hare leaves the gate
4 h 05 apart on the timetable
The last days
AA 9977 and AA 9781 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.