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EUR-Lex -  61998CC0203(01) - EN - Opinion of Mr Advocate General Alber delivered on 10 June 1999. - Commission of the European Communities v Kingdom of Belgium. - Failure by a Member State to fulfil its obligations - Articles 6 and 52 of the EC Treaty (now, after amendment, Articles 12 EC and 43 EC) - Air traffic - Registration of aircraft. - Case C-203/98.