that a ticket sold by the air carrier or its authorized travel agent contains: - a specification of the number, date and time of the flight, and - the notation 'OK', or any other entry, in the appropriate space on the ticket signifying the registration by the air carrier as well as the express confirmation by the air carrier of the reservation, le billet porte dans le cadre réservé a cet effet la mention "OK" par laquelle le transporteur aérien indique qu'il a enregistré et expressément confirmé la réservation