Reacting to the decision to close European airspace in April 2010 over worries about the ash plume from an erupting Icelandic volcano he said " there was no ash cloud . It was mythical . It 's become evident the airspace closure was completely unnecessary . " One study concluded that serious structural damage to aircraft could have occurred if passenger planes had continued to fly . Scientists and the industry as a whole remain unconvinced , however
an erupting Icelandic volcano
2010 eruptions of Eyjafjallajökull
Michael O'Leary (businessman)