An airline ticket confirmation number, technically known as a Record Locator or PNR (Passenger Name Record), is a unique 6-character alphanumeric code (e.g., Z7K4L2) used to identify your specific reservation in an airline's database. This code is the "master key" to your travel itinerary; you use it to check in online, select seats, add baggage, or make changes to your flight. It is important to distinguish this from your e-ticket number, which is a 13-digit number starting with the airline's specific code (e.g., 006 for Delta). While the e-ticket is the actual proof of payment and right to fly, the 6-character confirmation number is what you use for daily interactions with the airline's app or website. If your trip involves multiple airlines, you might actually have multiple confirmation numbers—one for the booking agency and separate ones for each individual carrier. In 2026, many airlines are moving toward biometric check-in where your face acts as your ID, but having your 6-character PNR code saved in your digital wallet or email is still the essential backup for navigating any airport terminal worldwide.