Last week, the NTSB held three days of hearings looking into what led up to the fatal crash between a plane and a helicopter in January.

The National Transportation Safety Board questioned witnesses Friday on collision avoidance technology and organizational 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,

The NTSB continued its hearings Thursday into the deadly air collision between a military aircraft and a passenger jet.