UA 3988 then AA 3009 at Charlotte
Houston → Charlotte → Washington National
Timetable, Charlotte time
10:49UA 3988 from Houston at the gate
11:29AA 3009 to Washington National leaves the gate
40 min apart on the timetable
The last days
UA 3988 and AA 3009 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.