NetJets, the private-aircraft company owned by Warren Buffett’s Berkshire Hathaway Inc., sued the U.S. over excise taxes and penalties totaling $642.7 million assessed against the company.

The Internal Revenue Service improperly assessed the so-called ticket tax, an excise tax on payments made in exchange for air transportation, NetJets said in its complaint in federal court in Columbus, Ohio, dated Nov. 14.

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