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,

Investigators so far have highlighted several factors that may have contributed to the collision, which left 67 people dead.

The head of the National Transportation Safety Board (NTSB) criticized the Federal Aviation Administration for not "taking ownership" in the deadly Black Hawk helicopter collision with a passenger jet near Washington Reagan National Airport in January.