February 21, 2012 12:28 am How Often Do Airliners Come Close to Colliding? NBC Bay Area Investigative Unit looks into near misses and near collisions above three Bay Area airports. US & World Videos 0:33 Livermore police search for suspect in double homicide 2:42 Forecast: Warm day, Saturday rain 3:05 Downtown First Thursdays offers new hope to struggling SF merchants 1:02 Crews knock down 2-alarm structure fire in SF's Nob Hill 1:11 24-hour online fundraiser underway for Peninsula nonprofits