Biggest climatic disruption to air travel

According to Official Guinness Records,

The biggest climatic disruption to air travel resulted in the cancellation of 100,000 flights and was caused by the erupting Eyjafjallajokull volcano, in Iceland, from 14 - 21 April 2010.
On 14 April 2010 the erupting Eyjafjallajokull volcano on Iceland began a highly explosive phase of activity, ejecting fine ash more than 8 km into the atmosphere. The ash cloud was carried by the jet stream toward Europe and, until 21 April 313 airports were closed, around 100,000 flights were cancelled and some 7 million people were stranded. The disruption is estimated to have cost the airline industry $2.2 billion.

For a complete list of 2010 records, please visit 2010 Guinness Records in Iceland.

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