The six-digit alphanumeric code that appears on your boarding pass is your PNR, or Passenger Name Reference—also known as your record locator, reservation code, or booking code.

An airline reference code, also known as a Record Locator or PNR (Passenger Name Record), is a unique six-character alphanumeric string (e.g., A1B2C3) that identifies your specific reservation in an airline's computer system. This code is the "key" to your entire itinerary; you need it to check in online, select your seat, or add baggage. It is important to note that if you book through a third-party site like Expedia, you may receive a "Booking ID" which is different from the actual Airline Confirmation Code. You must look for the specific code associated with the carrier (e.g., "United Confirmation") to access the airline's own management tools. In 2026, keep this code confidential, as anyone with your last name and this reference code can often access your personal details or even cancel your flight. It is usually found in the top-right corner of your e-ticket or confirmation email.