Comment Re:This is a problem now? (Score 5, Informative) 128
It was a NASA owned U-2. They do atmospheric testing. They basically fly a pattern in the sky over and over. The problem with the flight plan was that the U-2 was assigned VFR-on-Top. What that mean is the plane was flying using VFR(Visual) flight rules on top of clouds. This normally occurs below 18000 feet. As such, I think the VFR-on-Top system was only designed for below 18000 feet. As the U-2 was above 60000 feet, the system was processing it for conflicts at every altitude, causing a buffer overflow. They are working on a patch to fix that problem, and in the meantime have implemented a workaround for us. That's what our memo told us at work. Source: I'm an air traffic controller at Denver En-route ARTCC.