Of the 5,100 public airports across the country, only about 10% have air traffic control towers staffed by people who direct the flow of traffic.

As investigations into the Arizona mid-air collision continue, debates over air traffic safety, regulation, and infrastructure modernization remain front and center.

At least two people have died after two small single-engine planes collided midair Wednesday morning at an Arizona airport, officials said.

A midair collision involving two small planes in southern Arizona killed two people Wednesday morning, authorities said.

Tens of thousands of planes take off, land and perform touch-and-goes at the Marana Regional Airport in southern Arizona every year. Without an air traffic control tower, it's a calculated dance that requires communication by pilots.