AA 268 then UA 4500 at Detroit
Miami → Detroit → Washington
Timetable, Detroit time
09:10AA 268 from Miami at the gate
13:00UA 4500 to Washington leaves the gate
3 h 50 apart on the timetable
The last days
AA 268 and UA 4500 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.