UA 4040 then AA 9672 at Atlanta
Houston → Atlanta → Washington National
Timetable, Atlanta time
10:36UA 4040 from Houston at the gate
17:16AA 9672 to Washington National leaves the gate
6 h 40 apart on the timetable
The last days
UA 4040 and AA 9672 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.