1. By way of derogation from Article 157(2), Member States may provide for warehousing arrangements other than customs warehousing in the following cases:

(a) where the goods are intended for tax-free shops, for the purposes of the supply of goods to be carried in the personal luggage of travellers taking flights or sea crossings to third territories or third countries, where that supply is exempt pursuant to point (b) of Article 146(1);

(b) where the goods are intended for taxable persons, for the purposes of carrying out supplies to travellers on board an aircraft or a ship in the course of a flight or sea crossing where the place of arrival is situated outside the Community;

(c) where the goods are intended for taxable persons, for the purposes of carrying out supplies which are exempt from VAT pursuant to Article 151.

2. Where Member States exercise the option of exemption provided for in point (a) of paragraph 1, they shall take the measures necessary to ensure the correct and straightforward application of this exemption and to prevent any evasion, avoidance or abuse.