UA 2854 then AA 9788 at Philadelphia
San Francisco → Philadelphia → Charlotte
Timetable, Philadelphia time
07:39UA 2854 from San Francisco at the gate
12:30AA 9788 to Charlotte leaves the gate
4 h 51 apart on the timetable
The last days
UA 2854 and AA 9788 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.