A significant issue may have stemmed from the military Blackhawk helicopter involved in the collision - the lack of the Traffic Collision Avoidance System (TCAS) in military helicopters.

U.S. Transportation Secretary Sean Duffy said both aircraft had been flying standard flight patterns when the incident ...

The aircraft were flying too low for systems to generate voice commands to guide crews.

Commercial planes have technology that helps prevent crashes — but it has limitations, which was highlighted by the accident ...