This undated photo provided by the Regional Transportation Authority in Chicago shows a small office building in Sycamore, Ill., where United Aviation Fuels, Corp., a subsidiary of Unit

 

              This undated photo provided by the Regional Transportation Authority in Chicago shows a small office building in Sycamore, Ill., where United Aviation Fuels, Corp., a subsidiary of Unit
This undated photo provided by the Regional Transportation Authority in Chicago shows a small office building in Sycamore, Ill., where United Aviation Fuels, Corp., a subsidiary of United Airlines, is located. The RTA filed a lawsuit Monday, Jan. 14, 2013, alleging that United Airlines has been 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)