The National Transportation Safety Board questioned witnesses Friday on collision avoidance technology and organizational safety systems to manage risk. It is the third and final day of investigative hearings probing January’s midair collision between a US Army Black Hawk helicopter and an American Airlines regional jet,

WASHINGTON - Friday is the final day of the National Transportation Safety Board's three-day hearing on the deadly plane crash at Reagan Airport that took the lives of 67 people in January. Much of Thursday's focus was on air traffic controllers — and the long-held concerns about military traffic near Reagan National Airport.