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1. By 4 December 2012, Member States shall take all necessary measures in order to ensure the implementation of functional airspace blocks with a view to achieving the required capacity and efficiency of the air traffic management network within the single European sky and maintaining a high level of safety and contributing to the overall performance of the air transport system and a reduced environmental impact. Member States shall cooperate to the fullest extent possible with each other, in particular Member States establishing neighbouring functional airspace blocks, in order to ensure compliance with this provision. Where relevant, cooperation may also include third countries taking part in functional airspace blocks.

2. Functional airspace blocks shall, in particular:

(a) be supported by a safety case;

(b) enable optimum use of airspace, taking into account air traffic flows;

(c) ensure consistency with the European route network established in accordance with Article 6 of the airspace Regulation;

(d) be justified by their overall added value, including optimal use of technical and human resources, on the basis of cost-benefit analyses;

(e) ensure a smooth and flexible transfer of responsibility for air traffic control between air traffic service units;

(f) ensure compatibility between the different airspace configurations, optimising, inter alia, the current flight information regions;

(g) comply with conditions stemming from regional agreements concluded within the ICAO;

(h) respect regional agreements in existence on the date of entry into force of this Regulation, in particular those involving European third countries; and (i) facilitate consistency with Community-wide performance targets.

3. A functional airspace block shall only be established by mutual agreement between all the Member States and, where appropriate, third countries who have responsibility for any part of the airspace included in the functional airspace block. Before notifying the Commission of the establishment of a functional airspace block, the Member State(s) concerned shall provide the Commission, the other Member States and other interested parties with adequate information and give them an opportunity to submit their observations.

4. Where a functional airspace block relates to airspace that is wholly or partly under the responsibility of two or more Member States, the agreement by which the functional airspace block is established shall contain the necessary provisions concerning the way in which the block can be modified and the way in which a Member State can withdraw from the block, including transitional arrangements.

5. Where difficulties arise between two or more Member States with regard to a cross-border functional airspace block that concerns airspace under their responsibility, the Member States concerned may jointly bring the matter to the Single Sky Committee for an opinion. The opinion shall be addressed to the Member States concerned. Without prejudice to paragraph 3, the Member States shall take that opinion into account in order to find a solution.

6. After having received the notifications by Member States of the agreements and declarations referred to in paragraphs 3 and 4 the Commission shall assess the fulfilment by each functional airspace block of the requirements set out in paragraph 2 and present the results to the Single Sky Committee for discussion. If the Commission finds that one or more functional airspace blocks do not fulfil the requirements it shall engage in a dialogue with the Member States concerned with the aim of reaching a consensus on the measures necessary to rectify the situation.

7. Without prejudice to paragraph 6, the agreements and declarations referred to in paragraphs 3 and 4 shall be notified to the Commission for publication in the Official Journal of the European Union. Such publication shall specify the date of entry into force of the relevant decision.

8. Guidance material for the establishment and modification of functional airspace blocks shall be developed by 4 December 2010 in accordance with the advisory procedure referred to in Article 5(2) of the framework Regulation.

9. The Commission shall, by 4 December 2011 and in accordance with the regulatory procedure referred to in Article 5(3) of the framework Regulation, adopt implementing rules regarding the information to be provided by the Member State(s) concerned before establishing and modifying a functional airspace block in accordance with paragraph 3 of this Article.