On an e-ticket receipt, the airline code and ticket number is located at the bottom center of the receipt. In this example, you would enter 2150030834 in the ticket number box.

You can find your flight's 13-digit e-ticket number in several places, and it is important to distinguish it from your 6-character "Confirmation Code" (PNR). The most reliable source is the confirmation email sent by the airline or travel agency at the time of purchase; it is usually listed near the bottom or under the "Payment Details" section. If you cannot find the email, you can log into the airline's website or mobile app, navigate to "Manage Booking," and view the detailed receipt or "Passenger Receipt" for your trip. The e-ticket number always starts with the airline's specific 3-digit code (e.g., 001 for American, 006 for Delta, 016 for United). If you have already checked in, the number is often printed on your boarding pass, sometimes in a very small font near the barcode. If all else fails, you can call the airline's customer service or visit the check-in counter at the airport; after verifying your identity, they can provide the number, which is the actual legal document of your "right to fly" and is essential if you need to make changes, request a refund, or claim frequent flyer miles for a past trip.