AA 9955 then AA 5954 at Philadelphia
Savannah → Philadelphia → Harrisburg
Timetable, Philadelphia time
11:17AA 9955 from Savannah at the gate
18:05AA 5954 to Harrisburg leaves the gate
6 h 48 apart on the timetable
The last days
AA 9955 and AA 5954 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.