DL 541 then AA 1133 at Dulles
Seattle → Washington → Richmond
Timetable, Washington time
00:20DL 541 from Seattle at the gate
00:34AA 1133 to Richmond leaves the gate
14 min apart on the timetable
The last days
DL 541 and AA 1133 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.