COLUMBUS, Ohio (AP) — Private business jet operators are suing the Internal Revenue Service for $643 million, saying the government wrongly applied a ticket tax meant for commercial passengers only.The four Ohio-based subsidiaries of Columbus-based NetJets Inc. provide aircraft management services to people and companies that own planes.The lawsuit filed Monday in U.S. District Court in Columbus says the ticket tax was not intended to apply to private aircraft owners and the fees they pay to maintain and operate their planes.The companies are seeking back payment of the taxes with interest.An IRS spokeswoman had no immediate comment.The companies filing the lawsuit are NetJets Large Aircraft Inc., NetJets International Inc., NetJets Aviation Inc. and Executive Jet Management Inc.