CHICAGO – The Regional Transportation Authority of Illinois accused American Airlines and United Airlines of avoiding $300 million in sales taxes over the last seven years by conducting some business in “sham” offices set up outside of Cook County.

The RTA filed a lawsuit Monday in Cook County Circuit Court against United and plans to file litigation against American once it resolves its federal Chapter 11 bankruptcy case. The two operate offices in Sycamore, Ill., where they “accept” their jet fuel purchases made 50 miles away in Chicago, where both airlines have major hubs at O’Hare International Airport, the RTA said.

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