Learn About Adding a KTN to Your Delta Reservation

What Is a KTN and Why You Might Add One to Your Delta Reservation

A KTN, or Known Traveler Number, is a unique identifier issued by the U.S. Transportation Security Administration (TSA). This 10-digit number connects to your personal information in TSA databases. When you add a KTN to a Delta Air Lines reservation, it links your booking to your TSA profile. This connection allows TSA officers at airport security checkpoints to access certain information about you that you've previously provided to the government.

Delta Air Lines allows passengers to add KTNs during the booking process or after a reservation has been made. The airline system will retain this number for your flight records. Having a KTN associated with your reservation may provide information to TSA screeners, though the specific screening procedures and benefits depend on the type of KTN you hold and the current TSA protocols in place.

There are several programs that issue KTNs. The most well-known is TSA PreCheck, which requires an application and fee, and provides expedited screening at U.S. airports. Other programs that issue KTNs include NEXUS, SENTRI, and GOES, which are primarily designed for international travel. Military personnel may also receive KTNs through military credentials. Understanding which program issued your KTN helps you know what to expect at security.

According to TSA data, as of 2024, over 12 million individuals hold TSA PreCheck memberships. These members typically experience shorter security lines and may go through screening while keeping on shoes, belts, and light jackets. However, TSA PreCheck status does not guarantee any particular screening outcome—officers retain the right to conduct additional screening at any time.

Takeaway: A KTN is an identifier that connects your airline reservation to your TSA profile. Adding it to your Delta booking allows the TSA to see relevant information about you at security checkpoints. You should add your KTN to reservations if you hold one from TSA PreCheck or other TSA-approved programs.

How to Add a KTN to a New Delta Reservation

When you book a Delta flight, the reservation system provides a field where you can enter your KTN. This field typically appears during the passenger information section of the booking process. To add your KTN during a new reservation, locate the field labeled "Known Traveler Number" or "KTN." Enter your 10-digit number exactly as it was issued to you. Delta's system will store this information with your reservation.

The placement of the KTN field may vary depending on whether you're booking through Delta's website, mobile app, or with a travel agent. On Delta.com, the KTN field usually appears after you enter basic passenger information like name, date of birth, and contact details. On the Delta mobile app, the field location is similar. If you're booking through a third-party website or travel agent, you may need to enter the KTN separately after your initial booking is confirmed.

Here are the steps to add a KTN during a Delta flight booking:

• Begin your booking on Delta.com or the Delta app and enter your flight preferences
• Proceed to the passenger information section where you enter names and dates of birth
• Look for a field labeled "Known Traveler Number," "KTN," or similar phrasing
• Enter your 10-digit KTN in the correct format (no hyphens or spaces)
• Review your entry for accuracy before proceeding to payment
• Complete your booking and confirm that your KTN appears in your reservation confirmation

It's important to enter your KTN exactly as it appears in your TSA PreCheck or other TSA program documentation. If you have multiple known traveler numbers (for example, if you hold both TSA PreCheck and a military credential), enter only one KTN per reservation—typically the one most relevant to your current travel. You can verify your KTN by checking your program membership documentation, your TSA profile online, or your membership card.

Takeaway: Add your KTN during the booking process by entering it in the designated field after providing your name and date of birth. Make sure to enter the 10-digit number exactly as issued, and verify it's correct in your confirmation email.

How to Add a KTN to an Existing Delta Reservation

If you've already completed a Delta booking but didn't add your KTN at that time, you can still add it to your existing reservation. Delta provides options to modify reservations after they're booked. This is useful if you purchased your KTN through TSA PreCheck or another program after you made your flight reservation, or if you simply forgot to include it during the initial booking.

To add a KTN to an existing reservation, you'll need to access your booking through Delta's website or app. Visit Delta.com or open the Delta mobile app and select "Manage My Booking" or "My Trips." Enter your confirmation number and last name to retrieve your reservation. Once your booking appears on screen, look for an option to edit passenger information or modify details. This option is typically labeled "Edit Passenger Information," "Modify," or "Manage Passenger Details."

After selecting the edit option, navigate to the section where your personal information is displayed. You should see fields for your name, date of birth, and other details. In many cases, you'll find the KTN field in this same section, though it may have been blank during your initial booking. Click on the KTN field and enter your 10-digit number. Some versions of Delta's system may show the KTN field only after you select "Edit" or "Add" for that specific passenger.

The process for adding a KTN to an existing reservation varies slightly depending on your booking method. If you booked through a travel agent or third-party website, you may need to contact Delta directly to add the KTN. Delta's customer service can modify reservations by phone (1-800-221-1212) or through online chat on Delta.com. When you contact Delta, have your confirmation number and KTN ready to provide to the representative.

There are no fees or penalties for adding a KTN to an existing reservation. Once you've entered the KTN and saved your changes, Delta updates your reservation record. You should receive a confirmation email showing the updated reservation details with your KTN now included. Airlines typically update their systems within minutes, so your updated reservation should reflect the change quickly.

Takeaway: You can add a KTN to an existing Delta reservation by accessing your booking through "Manage My Booking," editing your passenger information, and entering your KTN in the designated field. Contact Delta customer service if you need help locating the KTN field or if you booked through a third party.

What Information You'll Need and How to Find Your KTN

Before you add a KTN to your Delta reservation, you'll need to locate and have your KTN available. Your KTN is a 10-digit number issued when you join a TSA program like TSA PreCheck. This number is specific to you and your program membership. Unlike a passport number or driver's license number, your KTN is created specifically for TSA screening purposes and should be treated as personal information that you keep with your travel documents.

If you have an active TSA PreCheck membership, your KTN can be found in several places. First, check your TSA PreCheck membership card, which was mailed to you when you joined the program. The KTN is printed on the front or back of this card. Second, log into your TSA PreCheck account on the official TSA website (tsa.gov) using your credentials. Your account dashboard displays your KTN. Third, check any confirmation emails from TSA that you received when you joined or renewed your membership—these emails often include your KTN.

If you're unsure whether you have a KTN, consider these scenarios. If you've gone through TSA PreCheck application and interview, you received a KTN. If you're a member of the U.S. military and have a military ID, you may have a KTN tied to your military status—check your military service documentation or contact your military records office. If you hold a NEXUS, SENTRI, or GOES card (programs for frequent international travelers),