"[It] must be interpreted as meaning that a passenger on a connecting flight, comprising two legs and subject to a single booking with a Community carrier, departing from an airport located in the territory of a Member State and arriving at an airport located in a third country via another airport in that third country," the court explained, "is entitled to compensation from the third-country air carrier which operated the entirety of that flight acting on behalf of that Community carrier, where that passenger has reached his or her final destination with a delay of more than three hours caused in the second leg of the said flight."