Article 3
1. Member States may grant exemptions from Article 2 for aeroplanes of historical interest. 2. Any Member State granting exemptions under paragraph 1 shall inform the competent authorities of the other Member States and the Commission of the fact and of the grounds for its decision. 3. Every Member State shall recognise the exemptions granted by another Member State in respect of aeroplanes entered on the registers of the latter. 4. In individual cases, Member States may permit the temporary use, at airports situated in their territory, of aeroplanes which cannot be operated on the basis of the other provisions of this Directive. This exemption should be limited to: (a) aeroplanes whose operations are of such an exceptional nature that it would be unreasonable to withhold a temporary exemption; (b) aeroplanes on non-revenue flights for the purposes of alterations, repair or maintenance.