Your booking reference, also known as a PNR (Passenger Name Record), is a six-character alphanumeric code (e.g., AB12CD) that is prominently displayed on your e-ticket confirmation. It is usually found in the top-right or top-left corner under the heading "Booking Reference," "Record Locator," or "Conf No." It is distinct from your 13-digit E-ticket number, which usually starts with the airline's three-digit code (e.g., 001 for American, 006 for Delta). If you cannot find the code on the PDF ticket itself, check the subject line or the body of the original confirmation email you received from the airline or travel agent (like Expedia or Flight Centre). If you still can't find it, you can log into the airline's website using your frequent flyer number, or call their customer service with your flight number and full name. Having this code is essential for checking in online, selecting seats, and managing your booking via the airline's mobile app, so it's a "pro tip" to take a screenshot of this specific code as soon as you receive your travel documents.