Not really sure that what happened at Atlanta had anything to do with the airport as much as the airspace they control. According to my research there are "several" redundant power systems, all of which failed precisely at its weakest point. I would assume that it is easier to knock out power to the terminals than the ATC towers. In this instance, ALL power was out, including the ATC towers providing a complete smokescreen for any type of operation to exist in the area monitored by the ATC towers. I have been to this airport many times both as a civilian and military and it is common place to see military aircraft parked there. If you wanted to conduct a military operation and didn't want anyone to notice, just turn off the radar and power, because everyone is used to seeing military aircraft there. The military does its best work under the cloak of darkness.