Elon Musk called Ryanair CEO Michael O'Leary an "utter idiot" who should be fired, escalating a public spat over installing Starlink internet on the airline's fleet. The feud began when O'Leary dismissed the satellite service, citing fuel drag and a potential $250 million annual cost for Ryanair.

Musk initially said O'Leary was "misinformed" about fuel impact. O'Leary retorted that Musk knows "zero" about aviation, calling him an "idiot" and X a "cesspit." The airline CEO estimated the satellite internet service would be too expensive for his low-cost carrier, which operates over 600 jets.

Musk's SpaceX has been aggressively pushing Starlink into the airline market. More than two dozen carriers, including United Airlines and Qatar Airways, have adopted the service. The public clash highlights the competitive stakes as satellite internet becomes a key feature for in-flight connectivity.

The dispute raises questions about technical feasibility and cost for budget airlines. While Lufthansa and others have embraced Starlink, Ryanair's resistance could signal broader industry skepticism. Watch for any formal response from Ryanair's board or further technical data from SpaceX to counter O'Leary's drag concerns.