14In particular, the last sentence of Article 23(1) of Regulation No 1008/2008 refers to ‘optional price supplements’, which are not unavoidable, in contrast to air fares or air rates and other items making up the final price of the flight, referred to in the second sentence of Article 23(1) of that regulation. Those optional price supplements therefore relate to services which, supplementing the air service itself, are neither compulsory nor necessary for the carriage of passengers or cargo, with the result that the customer chooses either to accept or refuse them. It is precisely because a customer is in a position to make that choice that such price supplements must be communicated in a clear, transparent and unambiguous way at the start of any booking process, and that their acceptance by the customer must be on an opt-in basis, as laid down in the last sentence of Article 23(1) of Regulation No 1008/2008.
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