How did a computer glitch ground flights across the US?

A computer glitch has grounded thousands of planes across the United States and disrupted international travel. So, how did this happen? And how vulnerable are crucial IT systems elsewhere? 

Join host Folly Bah Thibault.

Guests: 

Kyle Bailey - Former Federal Aviation Administration Safety Team Representative.

Jody Westby - Chief Executive at Global Cyber Risk.

Alex Macheras - Aviation Analyst.