European Union – Environment. The claimant air transport operator licensed in Switzerland contended that European Parliament and Council Decision 377/2013/EU (derogating temporarily from Directive (EC) 2003/87 establishing a scheme for greenhouse gas emission allowance trading within the Community), which had partially suspended the operation of an emissions trading scheme for aircraft, was a breach of the EU law principle of equal treatment. The Court of Appeal, Civil Division held that the extent of the exception to that general principle remained in doubt and referred two questions to the Court of Justice of the European Union for a preliminary ruling.