Case C-33/11: Judgment of the Court (Fourth Chamber) of 19 July 2012 (reference for a preliminary ruling from the Korkein hallinto-oikeus — Finland) — A Oy (Sixth Directive — Exemptions — Article 15(6) — Exemption for the supply of aircraft used by airlines operating for reward chiefly on international routes — Supply of aircraft to an operator who makes them available to such an undertaking — Concept of ‘operating for reward on international routes’ — Charter flights)