20In the light of all of the foregoing considerations, the answer to the question is that the concept of ‘optional price supplements’, referred to in the last sentence of Article 23(1) of Regulation No 1008/2008, must be interpreted as meaning that it covers costs, connected with the air travel, arising from services, such as the flight cancellation insurance at issue in the main proceedings, supplied by a party other than the air carrier and charged to the customer by the person selling that travel, together with the air fare, as part of a total price.
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