Article 12 5.

Member States shall ensure that any aviation fuel supplier that fails to comply with the obligations laid down in Article 4 relating to the minimum shares of synthetic aviation fuels and, over the period from 1 January 2030 until 31 December 2034, the average shares of synthetic aviation fuels, is liable to a fine. That fine shall be proportionate and dissuasive and not less than twice as high as the amount resulting from the multiplication of the difference between the yearly average price of synthetic aviation fuel and conventional aviation fuel per tonne by the quantity of the aviation fuel not complying with the minimum shares referred to in Article 4 and Annex I. When establishing the fine relating to the average shares of synthetic aviation fuels, Member States shall take into account any fine, relating to the minimum shares of synthetic aviation fuels to which the aviation fuel supplier is already liable in respect of the respective period referred to in this paragraph, in order to avoid a double penalty.