AA 1998 then AA 9954 at Philadelphia
Cleveland → Philadelphia → Atlanta
Timetable, Philadelphia time
07:29AA 1998 from Cleveland at the gate
15:30AA 9954 to Atlanta leaves the gate
8 h 01 apart on the timetable
The last days
AA 1998 and AA 9954 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.