Your airline reference—also known as a Record Locator, PNR (Passenger Name Record), or Confirmation Code—is a unique six-character alphanumeric string (e.g., AB12CD). You can find it in your booking confirmation email sent by the airline or the travel agency (like Expedia). It is usually prominently displayed in the subject line or the "Trip Summary" section. If you have the airline's mobile app, the reference will be listed under "My Trips" once you log in. You can also find it on your digital or printed boarding pass after you check in. If you lost your email, you can retrieve the reference by calling the airline's customer service and providing your flight number, date, and credit card information used for the purchase. In 2026, most airlines also allow you to find your reference by entering your passport number or frequent flyer ID on their website. It is important to distinguish the "Airline Reference" from the "Ticket Number" (a 13-digit code); the 6-character reference is what you need for most self-service kiosks and online check-in procedures.