confirmed reservation
as defined in Council Regulation (EEC) No 295/91 of 4 February 1991 establishing common rules…, Article 2, point (b)
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