Associated Press
This undated photo provided by the Regional Transportation Authority in Chicago shows the door for United Aviation Fuels Corp., a subsidy of United Airlines, at a small office building in Sycamore, Ill. The RTA filed a lawsuit Monday, Jan. 14, 2013, alleging that United Airlines is falsely claiming to buy jet fuel out of what it calls this "sham" office in rural Illinois since 2001 to avoid paying tens of millions of taxes in Chicago, where it says the purchases are actually being made. (AP Photo/Regional Transportation Authority)

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