Ryanair boss Michael O'Leary has weighed into the tax dispute between Apple and the European Union, saying the Irish government should write a letter to the EU telling them to "f**k off".
Dubbing the EU's ruling "bizarre", the outspoken Irishman said: "One of the fundamental principles of the European Union is that each country has its autonomy to make its own tax decisions.
"Frankly the Irish government should turn around - they shouldn't even appeal the decision - they should just write a letter to Europe and tell them politely to f**k off.
"The idea that you have the state aid mob - who've had more court verdicts overturned than any other department in Europe in the last 20 years - come along 10 years after the fact and say, 'no we didn't like that, we think you should have done something else', is frankly bizarre."
On Tuesday, Europe's antitrust commissioner Margrethe Vestager slapped the maker of iPads and iPhones with a 13 billion euro (£11.1 billion) tax bill. She claimed Apple paid just 1% tax on its European profits in 2003 and 0.005% in 2014, and said its arrangement with the Irish government is illegal under state aid rules.
Apple is set to challenge the decision, and Mr O'Leary added: "I think there's no chance of this surviving a court ruling in Europe. There's certain things that Europe has no competence in."
Mr O'Leary went on to claim that Ryanair was "one of the most compliant taxpayers in Ireland", having paid a tax rate of about 11.9% on profits last year.
On Brexit, the chief executive, who backed the Remain campaign during the EU referendum, expects the UK to suffer "significant economic damage" as a result of its decision to quit the single-bloc. However, he added that it is too soon to revise the company's financial guidance.
In July Ryanair said it would "pivot" growth away from UK airports and instead focus on hubs in the European Union following the Brexit referendum result.
The firm said its growth rate in the UK is expected to slow from about 15% to 6% next year.
However, with long-term growth in mind, Mr O'Leary is now calling on the UK Government to approve three new runways in a bid to end Britain's airport capacity conundrum for "the next 50 years".
He urged Theresa May's government to be "radical in its decision making" and rubber-stamp new runways at Heathrow, Gatwick and Stansted airports.
The proposal would mean ending the battle between Gatwick and Heathrow for a new runway.
"Ryanair calls on the new UK Government to be radical in its decision making on new runways for London instead of picking just one (Heathrow or Gatwick) and calls on Prime Minister Theresa May to approve 3 new runways - one each at Heathrow, Gatwick and Stansted, which will finally resolve the runway capacity issue for the next 50 years, while ensuring competition between airports delivers efficient facilities and prevents airlines and passengers being ripped off by gold-plated monopoly runways," he said.
Last year, the Government's Airports Commission said a third runway at Heathrow is the best route to expanding airport capacity.
David Cameron stalled on backing the recommendation, saying the Government required more time to assess the environmental impact. A decision is now expected before the end of the year.
Mr O'Leary said that expanding only one airport would allow airlines to justify raising prices for customers, who might subsequently help foot the bill. But competition between three airports would be a boon for travellers and benefit Ryanair long-term, he claimed.
"We'll have more capacity to grow, fares will fall and in a declining fare environment, we'll win," O'Leary said.
Mr O'Leary made the announcement as he trumpeted new routes to Strasbourg and Faro and more flights to Sofia and Nuremberg from Stansted, Gatwick and Luton airports.