SpaceX CEO Elon Musk.

On Tuesday, the Federal Aviation Administration levied proposed fines of hundreds of millions of dollars against SpaceX for violations related to rocket launches last year. Soon after, Elon Musk, the billionaire CEO of the commercial rocket and satellite company, threatened legal action to fight the citations.

“SpaceX will be filing suit against the FAA for regulatory overreach,” Musk wrote on X, the social platform he owns.

The fines, worth more than $630,000, are related to unapproved plans used during two SpaceX rocket launches last year. The first incident, from last May at Florida’s Cape Canaveral, was over a revised communications plan, in which SpaceX added an unauthorized new launch control room........

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