(c) Runway change - operational advantage. In a multiple airport terminal area, less than
optimum capacity caused by a runway configuration change that will allow for increased airport
capacity at secondary airports.
So it seems like that the some sort of condition in the area was making it that only certain rwy's can be used at ATL to take into consideration other airports in the area....
I second this opinion. With five runways, ATL can run:
2 in/3 out
3 in/2 out
2 in/2 out/1 mixed
My guess is they're using the second option for maximum arrival capacity. Here in CSG, the weather has just cleared after morning fog and overcast skies; perhaps there had been a GDP or something, and now ATC is clearing the backlog.
This makes a lot more sense than giving priority to other area airports. I can't imagine our little CSG, or MGM, or CHA or SAV or CAE or GSP could possibly affect ATL traffic.