A contract for a stay including a return flight from Geneva to New York and three nights' hotel accommodation in New York was concluded via the Internet. Having been unable to board a flight to that city (New York) on the ground that he did not have the ESTA-type travel authorisation required by the US authorities to travel to the United States, the buyer summoned the vendor to pay compensation, even though the vendor of travel or holiday services had informed the consumer in writing, prior to the conclusion of the contract, of the administrative formalities to be completed by the consumer in the event of a border crossing.