Michael O'Leary, the head of airline Ryanair, has launched a vitriolic attack on Met Office forecasters after they triggered an unprecedented six-day lockdown of British airspace in April.
Mr O'Leary, the airline's chief executive, rounded on the Volcanic Ash Advisory Centre for its handling of aviation's biggest crisis since the war.
The low-cost airline's outspoken boss, whose initial response to the Met Office's handling of the volcanic eruption had been restrained, described the creation of a no-fly zone as "entirely unnecessary."
During the six day shutdown thousands of flights were grounded and the travel plans of millions of passengers were thrown into disarray.
In April Mr O'Leary was careful not to join others in the industry who had poured scorn on the charts produced by the Met Office which led to the closure of British airspace.
But with his airline facing a £50 million bill as a result of the lockdown - mainly in paying the hotel and food bills of those stranded by the wave of flight cancellations - Mr O'Leary was withering in his condemnation.
He said that Met Office charts "suggested the that the big black plume of volcanic ash had spread from Iceland all over the southern Atlantic, much of continental Europe and half way across Russia as well as over a large part of the arctic circle.
"The fact is the sun wasn't blocked out in any of these areas and none of is could see a bl**dy thing didn't seem to worry the Met Office, where we suspect the only place that there was volcanic ash was in the basement of the Met Office or in between the ears of the people who produced these charts," he said.
"I don't mind paying passenger right to care when it is our fault. But if it is not our fault and some stupid regulator or government has closed down airspace, because some idiot in a basement in the Met Office in London spills coffee over the map of Europe and produces a big black cloud, we shouldn't be paying for your right to care," Mr O'Leary continued.
"The made a complete dog's balls of it yet passed this cost onto the airlines We paid compensation for their mismanagement for and incompetence."
Mr O'Leary also called for the amendment of EU regulations which meant that airlines had to pick up stranded passengers' hotel bills following the volcanic eruption.
"It's absurd that your travel insurance company pays out nothing because it's an act of God and therefore is excluded from the policy, yet the poor old airline pays for your seven or four extra days of holidays in the Canary Islands at a cost far in excess of the 30 euros you paid us."
Mr O'Leary also denied "profiteering" after Ryanair announced that customers will face higher baggage charges in the peak July and August months.
Customers will have to pay £20 for their first checked-in bag, up from £15, and £50 for their second bag - doubled from £25. He insisted it was a move to discourage passengers from carrying unnecessary amounts of baggage for short breaks.
The Met Office defended its handling of the volcanic ash crisis. "We work to recognised international standards which are set aviation industry itself. Our model can be configured to provide forecasts to any tolerance of ash that is deemed safe by the aviation regulatory authorities.
"The advice we produce always combines information from radar, satellite and research aircraft. We use this material to create and verify our forecasts.
"Our dispersion model has a highly successful track record — including prediction of the spread of pollution resulting from the 1991 Kuwaiti oil fires during the First Gulf War); The movement of the smoke plume across southern England from the 2005 Buncefield oil depot accident and the 2008 Bluetongue outbreak in northern Europe."