Fake ash cloud created for new plane equipment tests
13 November 2013 Last updated at 17:54 GMT
Easyjet has created a fake ash cloud and flown through it in order to test a new piece of on-board equipment
It is meant to help passenger aircraft in the event of a volcanic eruption.
This is a response to the eruption in 2010 of a volcano in Iceland that caused severe disruption to UK and European passenger flights.
Richard Westcott reports.