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1. The cost bases for charges for air navigation services shall consist of the determined costs, as established in the performance plans adopted in accordance with Article 24(6), related to the provision of those services in the en route charging zone and terminal charging zone concerned.

2. The determined costs referred to in paragraph 1 shall include the costs of relevant facilities and services, cost of capital and depreciation of assets, as well as the costs of maintenance, operation, management and administration, including staff costs.

3. The determined costs referred to in paragraph 1 shall also include the following costs:

(a) costs related to the oversight of air navigation services incurred by national supervisory authorities, national competent authorities, and other national authorities entrusted by Member States to carry out tasks in relation to this Regulation and Regulation 2018/1139, where the Member State so decides;

(b) costs incurred by the air navigation service providers designated under Articles 8 and 10, in relation to the provision of air navigation services and the network functions;

(c) costs stemming from the Eurocontrol International Convention relating to cooperation for the safety of air navigation of 13 December 1960 as last amended, where the Member State so decides.

4. Determined costs shall not include the costs of penalties imposed by Member States in accordance with Article 53.

5. Costs that pertain to both en route air navigation services and terminal air navigation services shall be allocated in compliance with the general principles referred to in Article 21(4), point (l). Cross-subsidy between en route air navigation services and terminal air navigation services shall not be allowed. Cross-subsidy shall be allowed between different air navigation services within either one of those two categories only when justified for objective reasons, subject to transparent identification in accordance with Article 36(3).

6. Air navigation service providers designated under Articles 8 and 10 shall provide details of their cost base to the national supervisory authority. To this end, costs shall be broken down by distinguishing staff costs, operating costs other than staff costs, depreciation costs, cost of capital, exceptional costs and costs referred to in Article 30(3). For the purpose of enabling the Commission to carry out its tasks under this Regulation, the national supervisory authority shall provide this information to the Commission in accordance with the modalities defined in the implementing act referred to in Article 33.