A PNR (Passenger Name Record) number, also known as a record locator or booking reference, is typically a 6-digit alphanumeric code (e.g., XJ7K2P or LHR4S9). It is a unique identifier generated by an airline's computer reservation system to locate your specific itinerary. In 2026, while most global airlines use this 6-character format, some systems like the Indian Railways (IRCTC) use a 10-digit numeric PNR (e.g., 432-6789123) to track train reservations. On an airline confirmation, it is usually found in the top right corner or under the "Booking Reference" section. It contains all your vital travel data, including name, flight segments, contact info, and special requests, and is used by ground staff and automated kiosks to pull up your boarding pass and check your bags.