Warren Buffett's private jet firm NetJets is suing its pilots' union over claims of defamation

• NetJets has sued its pilots' union, accusing it of defamation over safety claims.
• The union took out an ad referencing the Boeing blowout, but NetJets doesn't operate any Boeing planes.
• "We view the lawsuit as an attempt to silence us," the union's president said this week.

NetJets, the private jet firm owned by Warren Buffett's Berkshire Hathaway, is suing its pilots' union.

Filed Monday in an Ohio state court, the lawsuit accuses the union of defaming NetJets.