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1. Air navigation service providers, independently of their system of ownership or legal structures, shall annually draw up and publish their financial accounts. These accounts shall comply with the international accounting standards adopted by the Union. Where, owing to the legal status of the air navigation service provider, full compliance with the international accounting standards is not possible, the provider shall achieve such compliance to the maximum possible extent. Air navigation service providers shall publish an annual report and regularly undergo an independent audit for the accounts referred to in this paragraph.

2. National supervisory authorities shall have the right to access the accounts of the air navigation service providers under their supervision. Member States may decide to grant access to these accounts to national supervisory authorities of other Member States. Where necessary to enable the Commission to carry out its tasks under this Regulation, national supervisory authorities shall provide this information to the Commission.

3. Air navigation service providers shall, in their internal accounting, keep separate accounts for each air navigation service as they would be required to do if these services were carried out by separate undertakings with a view to avoiding discrimination, cross-subsidisation and distortion of competition. An air navigation service provider shall also keep separate accounts for each activity where:

(a) it provides air navigation services procured in accordance with Article 11(1) and 11(2) and air navigation services not covered by that provision;

(b) it provides air navigation services and carries out other activities, of whatever kind, including CIS;

(c) it provides air navigation services in the Union and in third countries. The determined and actual costs deriving from air navigation services shall be broken down into costs categories in accordance with Article 30(6) and they shall be made publicly available, without prejudice to Article 52(3).

4. The financial data reported in accordance with Article 29(6) and other information relevant for the calculation of unit rates shall be audited or verified by the national supervisory authority or an entity independent of the air navigation service provider concerned and approved by the national supervisory authority. The conclusions of that audit shall be made publicly available without prejudice to Article 52(3).