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.
A medical transport jet transporting a child who had just completed treatment for a life-threatening condition, her mother and four others crashed into a Philadelphia neighborhood.
A medical transport jet transporting a child who had just completed treatment for a life-threatening condition, her mother and four others crashed into a Philadelphia neighborhood.