NBC is carrying a story that claims a U-2 spy plane's height and route through KZLA (L.A. ARTCC) somehow triggered the ATC primary and backup computers for KZLA to fail, which forced the FAA to ground stop flights into that area for about an hour:
http://www.nbcnews.com/news/investi...affic-control-computers-shuts-down-lax-n95886
http://www.nbcnews.com/news/investi...affic-control-computers-shuts-down-lax-n95886