Billionaire Elon Musk has said Europe's largest airline Ryanair's CEO Michael O'Leary is an "utter idiot" who should be fired amid a public spat between the duo over the cost of installing Starlink on planes. This comes after O'Leary had called Musk an "idiot" and X a "cesspit", claiming that the service could cost the airline up to $250 million/year.