Article 21
Member States shall ensure that a trader is liable for any errors due to technical defects in the booking system which are attributable to him and, where the trader has agreed to arrange the booking of a package or of travel services which are part of linked travel arrangements, for the errors made during the booking process. A trader shall not be liable for booking errors which are attributable to the traveller or which are caused by unavoidable and extraordinary circumstances.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-11 · Text as adopted (Official Journal); later amendments are not incorporated in this text.