Article 5 1.

Regular services shall be open to all, subject, where appropriate, to compulsory reservation.

Such services shall be subject to authorisation in accordance with the provisions of Chapter III.

Regular services from a Member State to a third country and vice versa shall be subject to authorisation in accordance with the bilateral agreement between the Member State and the third country and, where appropriate, the transited Member State, as long as the necessary agreement between the Community and the third country concerned has not been concluded.

The regular nature of the service shall not be affected by any adjustment to the service operating conditions.

The organisation of parallel or temporary services, serving the same public as existing regular services, the non-serving of certain stops and the serving of additional stops on existing regular services shall be governed by the same rules as those applicable to existing regular services.