In the airline industry, a PNR (Passenger Name Record) is the digital backbone of any booking, and it requires five mandatory elements to be considered "complete" and saved in a Global Distribution System (GDS) like Amadeus or Sabre. These elements are: (1) Name, which includes the surnames and first names of all travelers; (2) Itinerary, which details at least one flight segment, including flight number, date, and class of service; (3) Contact, which provides the phone number or email of the passenger or the travel agency; (4) Ticketing Arrangement, which specifies how and when the ticket will be issued (or a time limit for purchase); and (5) Received From, which records the name of the person or entity making the reservation. Without these five pieces of data, the system will not generate a Record Locator (the 6-character alphanumeric code), and the reservation will not exist. In 2026, additional "optional" elements like Passport Data (APIS) are often required for international travel.