AA 410 then UA 6203 at Charlotte
Denver → Charlotte → Washington
Timetable, Charlotte time
11:10AA 410 from Denver at the gate
15:05UA 6203 to Washington leaves the gate
3 h 55 apart on the timetable
The last days
AA 410 and UA 6203 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.