BOSTON - A company that sells aviation fuel at an airport failed to demonstrate that a competitor conspired with the airport authority to interfere with its business in violation of federal antitrust law, the First Circuit U.S. Court of Appeals affirmed June 17 (Diaz Aviation Corporation, et al. v. Airport Aviation Services, Inc., et al., No. 12-1859, 1st Cir.; 2013 U.S. App. LEXIS 12069).