55First, in Commission v UIC (paragraph 44) the Court of Justice held that ‘it was the whole of the transport sector which was removed from the scope of [Regulation No 17] by Regulation No 141, which was subsequently replaced by the three sectoral regulations’ and, in particular, by Regulation No 3975/87 in the case of transport by air. Since, as regards the air transport sector, Regulation No 141 was replaced by Regulation No 3975/87, all the activities in the air transport sector not falling within the scope of Regulation No 3975/87 are necessarily covered by Regulation No 17, not Article 89 of the Treaty.