In the aviation industry, a flight confirmation number is officially known as a PNR, which stands for Passenger Name Record (it is often misread or mistyped as "PRN"). A PNR is a unique 6-character alphanumeric code—such as "AE5RT9"—that serves as a digital "file address" within an airline's Computer Reservation System (CRS). This record acts as a master folder containing all vital details regarding your journey, including the passenger's full name, contact information, ticketing status, seat assignments, meal preferences, and the specific flight segments booked. When you check in online or at a kiosk, you typically enter this PNR to pull up your itinerary. It is important to keep this code private, as anyone with your PNR and last name can often access your personal data or modify your flight through the airline's website. If you see "PRN" on a document, it is likely a clerical error, as the global standard for these record locators remains the PNR system used by all major Global Distribution Systems (GDS) like Amadeus and Sabre.