Where the defendants failed to make offers of proof after the U.S. District Court excluded evidence, there was no basis to challenge the exclusions on appeal. The 7th U.S. Circuit Court of Appeals affirmed a decision by U.S. District Judge Harry D. Leinenweber. United Airlines contracts with other firms for regional air services under the United Express label. Trans States Holdings is one of United’s suppliers. Trans States owns two air carriers: Trans States Airlines and GoJet Airlines. Darren Cuff was the …