Just a few weeks ago, if we had been asked to name the biggest threat to the world’s airline industry, we would have said terrorism.
And we would have been way off base. The correct answer of course is Eyjafjallajokull.
Iceland's volcanic eruption emptied the skies and crippled the international airline industry.
60 Minutes reporter Liz Hayes travels to Iceland and finds out that Eyjafjallajokull isn’t the only volcano we need to worry about.
Click here to watch the full 60 Minutes clip