AA 5154 then UA 2489 at Dulles
Charlotte → Washington → Newark
Timetable, Washington time
12:51AA 5154 from Charlotte at the gate
21:00UA 2489 to Newark leaves the gate
8 h 09 apart on the timetable
The last days
AA 5154 and UA 2489 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.