Exactly why the airlines are nervous.

There are not many news reports out there explaining the deeper nervousness of airlines executives...So we are going to explain it.

In the past 500 years: 1/3 of all of the global lava output has erupted by volcanoes in the tiny island nation of Iceland.

Eyjafjallajokull is the volcano that just erupted in Iceland. We have it listed above. Similar to Eyjafjallajokull: Iceland's other volcano are dormant, ice-capped and are currently glaciers.

Now notice something - Eyjafjallajokull is quite small in comparison when compared to Iceland's other Volcanoes!

The Katla volcano is directly to the right of Eyjafjallajokull. This volcano is significantly larger and more dangerous than Eyjafjallajokull. Katla typically erupts once every 40-80 years - and its last eruption was in 1918.....

Oh - and in the past 1,000 years, all three known eruptions of Eyjafjallajökull have triggered subsequent Katla eruptions.

Needless to say - USA and European airlines do in fact have something very large to worry about.