Newark Liberty International Airport has been a mess the past week, with hundreds of flights cancelled and hundreds more delayed. It was triggered in part by an incident on April 28, when air traffic controllers for the airport experienced a radar and communications blackout. They were unable to reach approaching planes.

There were no accidents, and Transportation Secretary Sean Duffy later told reporters that the outage lasted for 30 seconds.

After that incident, several air traffic controllers took time off to deal with the stress and trauma. That, on top of bad weather, a runway that's closed for repair and an already short-staffed air traffic controller corps, led to a lot of disruption.

David Grizzle, the former chief operating officer and head of air traffic control for the Federal Aviation Administration, says what happened at Newark isn't surprising, given decades-old staffing and technology issues. He explains what it would take to fix air traffic control in the U.S.

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