AA 3004 then UA 665 at Charlotte
Miami → Charlotte → Newark
Timetable, Charlotte time
08:25AA 3004 from Miami at the gate
15:00UA 665 to Newark leaves the gate
6 h 35 apart on the timetable
The last days
AA 3004 and UA 665 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.