36As regards the manner in which those prices must be set, Article 23(1) of Regulation No 1008/2008 requires, in particular, on the one hand, that the unavoidable and foreseeable items included in the price of the air service are always specified as elements of the final price to be paid, and, on the other hand, that the price supplements, which relate to services that are neither compulsory nor necessary for the air service itself, are 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 (see, to that effect, ebookers.com Deutschland, EU:C:2012:487, paragraph 14).
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