Judgment_paragraph 68 · The Queen, on the application of International Air Transport Association and European Low Fares Airline Association v Department for Transport (C-344/04)

68The principle of legal certainty is a fundamental principle of Community law which requires, in particular, that rules should be clear and precise, so that individuals may ascertain unequivocally what their rights and obligations are and may take steps accordingly (see Case 169/80 Gondrand Frères and Garancini [1981] ECR 1931; Case C-143/93 Van Es Douane Agenten [1996] ECR I-431, paragraph 27; and Case C-110/03 Belgium v Commission [2005] ECR I-2801, paragraph 30).