Learn About Your TSA Known Traveler Number

What Is a TSA Known Traveler Number?

A TSA Known Traveler Number, or KTN, is an identification code issued by the Transportation Security Administration that connects your identity to trusted traveler programs. This nine-character alphanumeric code serves as a link between you and the TSA's security screening systems at airports across the United States. When you provide your KTN during flight booking or check-in, the TSA can verify that you have already undergone background checks through one of their trusted traveler programs.

The KTN system was created to streamline the airport security process for travelers who have completed vetting procedures. Rather than treating every passenger as a potential security risk, the TSA uses the information associated with your KTN to determine your level of risk. This allows the agency to focus resources on passengers who may require more thorough screening while moving known, vetted travelers through expedited processes.

Your KTN is different from other travel documents like your passport or driver's license. It exists solely within TSA systems and the trusted traveler programs that issue them. You cannot use a KTN for any purpose other than TSA security screening at U.S. airports. The number itself contains no personal information—it is simply a reference code that connects to your background check results and program status in the TSA database.

Practical Takeaway: Understanding that a KTN is a specific security screening tool—not a general travel document—helps you know what it can and cannot do for you. Your KTN only affects how you move through TSA checkpoints, not other aspects of your travel.

The Trusted Traveler Programs That Issue KTNs

The TSA does not directly issue KTNs. Instead, the number comes from one of five trusted traveler programs that partner with the TSA. Each program has its own requirements, costs, and benefits. Understanding which programs offer KTNs is important because your choice of program affects the cost you pay, how long approval takes, and what additional travel benefits you receive beyond the TSA KTN itself.

TSA PreCheck is the most well-known trusted traveler program. It costs $85 to $100 for a five-year membership, depending on the provider. TSA PreCheck members get a KTN and may proceed through expedited security screening at over 200 U.S. airports. Expedited screening means you can keep your shoes, belts, and light jackets on; leave your laptop and liquids bag in your carry-on; and move through dedicated security lanes. According to TSA data, TSA PreCheck members wait an average of five minutes or less at security checkpoints.

Global Entry is a U.S. Customs and Border Protection program that costs $100 for a four-year membership. It is designed for U.S. citizens and lawful permanent residents who travel internationally. Global Entry includes a KTN and allows expedited screening when returning to the United States from foreign countries. Global Entry members also receive TSA PreCheck benefits automatically. Over 600 airports worldwide recognize Global Entry membership.

NEXUS, SENTRI, and CARD are three additional programs. NEXUS serves travelers who cross the U.S.-Canada border and costs $50 for a five-year membership. SENTRI is for frequent U.S.-Mexico border crossers and costs $122.50 for a four-year membership. CARD is for commercial drivers and costs $97.50 for a two-year membership. Each of these programs provides a KTN and includes TSA PreCheck benefits. All five programs require passing a background check that examines your criminal history, immigration status, and security records.

Practical Takeaway: Your first step should be determining which trusted traveler program matches your travel patterns and budget. International travelers benefit from Global Entry, while domestic-only travelers often choose TSA PreCheck. Border commuters should investigate NEXUS or SENTRI.

How to Obtain Your KTN Through the Application Process

Getting a KTN involves working with the specific trusted traveler program you choose. The process typically begins on the program's official website, where you create an account and enter personal information. You will need to provide your full legal name, date of birth, citizenship information, and travel document numbers like your passport or driver's license. The process requires you to set up a username and password for tracking your status.

After submitting your initial information, you will pay the program fee. Payment methods usually include credit cards, debit cards, and in some cases, money orders or personal checks. Payment processes are secure and encrypted. Once the program receives your payment and initial submission, they begin a background check process that examines criminal records, immigration databases, and TSA security databases. This background check typically takes between 48 hours and two weeks, though some applications take longer if additional verification is needed.

Most trusted traveler programs require an in-person appointment at an enrollment center or airport location. During this appointment, a program representative will verify your identity documents, take your photograph, and collect your fingerprints. The TSA operates enrollment centers in most major metropolitan areas. For example, the Los Angeles area has over 10 enrollment centers where you can complete your appointment. Some programs allow you to schedule appointments online, while others operate on a first-come, first-served basis. The appointment itself typically takes 15 to 30 minutes.

Once your background check clears and your appointment is complete, the program issues your KTN. Most programs provide your KTN immediately after your appointment or within a few days through email or your online account. Some programs issue a physical membership card that arrives by mail within one to two weeks. Your KTN becomes active as soon as it is issued, and you can begin using it for flight bookings immediately.

Practical Takeaway: Set aside time to research enrollment centers near you and plan an in-person appointment well before your first trip. Applications can take several weeks from start to finish, so beginning the process before you have urgent travel plans prevents delays.

Where and How to Use Your KTN

Your KTN is used exclusively at Transportation Security Administration checkpoints in U.S. airports. You provide your KTN when you book flights with airlines, during online check-in, at airport kiosks, or directly to TSA agents at the security checkpoint. Each of these touchpoints allows you to link your trusted traveler status to your specific flight, which tells TSA screeners that you have completed their vetting process.

When booking flights, most major airlines have a dedicated field in their website or mobile app where you can enter your KTN. Airlines like American, Delta, United, Southwest, and Alaska all accommodate KTNs in their reservation systems. Entering your KTN during booking ensures that the information is attached to your flight record before you arrive at the airport. You can also add your KTN to your airline profile, which automatically populates the field on future bookings.

If you forget to add your KTN during booking, you can provide it at airport check-in kiosks or directly to the TSA agent at the security checkpoint. However, some airports may not process your KTN request if you mention it too late in the checkpoint process. Providing your KTN during the booking or check-in stages allows more time for the system to be updated. TSA agents at the checkpoint have access to KTN information and can verify your status in their systems.

Your KTN works at over 200 U.S. airports that operate TSA PreCheck screening. A complete list of participating airports is available on the TSA website. Not every airport has a dedicated PreCheck security lane, but TSA PreCheck benefits may still apply at smaller airports. TSA PreCheck benefits apply to any airline operating at that airport, so you are not limited to specific carriers. International airports and major domestic hubs like Atlanta, Dallas, Los Angeles, Chicago, and New York all have full PreCheck programs.

Important limitation: Your KTN only affects TSA security screening in the United States. It does not change how you go through customs when returning from international flights, nor does it apply to foreign airports or foreign airlines' security processes. International TSA PreCheck programs like Global Entry do affect customs return screening but through separate systems and benefits, not through the KTN itself.

Practical Takeaway: Add your KTN to your airline profile and enter it during every flight booking. This consistent approach ensures that your trusted traveler status is communicated to the TSA before you reach the airport.

What Benefits Your KTN Provides at Security Checkpoints