
The Known Traveler Number (KTN) is issued to individuals approved for the TSA PreCheck® expedited screening program. This program allows eligible travelers to speed up their screening process at participating U.S. airports and for most international trips. If you have a KTN, it is important to add it when booking airline travel reservations to have the TSA PreCheck® indicator on your boarding pass. However, if you add your KTN after checking in, you will need to obtain a new boarding pass. This paragraph aims to address the question of whether individuals can add their KTN at airport check-in and provides relevant information about the KTN and TSA PreCheck® program.
| Characteristics | Values |
|---|---|
| KTN addition at airport check-in | If you add your KTN after checking in, you’ll need to get a new boarding pass. |
| KTN addition process | The Known Traveler Number (KTN) must be added in the KTN field when booking airline travel reservations to have the TSA PreCheck® indicator appear on your boarding pass. |
| KTN field | For members approved for the TSA PreCheck® Application Program, this number is 9 or 10 digits long, can be a combination of numbers and letters and typically begins with TT for those who enrolled through IDEMIA, TE for Telos, or AC for CLEAR. |
| KTN eligibility | If your KTN is still active, confirm with your airline that your KTN, name, and date of birth are accurate. |
| KTN alternatives | If you’re registered with a CBP program, you’ll receive a 9-digit PASS ID, which is the same number for all CBP programs. |
| KTN and TSA PreCheck® | TSA PreCheck® is an expedited security program allowing eligible travelers to speed up their screening process at participating U.S. airports and for most international trips. |
| KTN and Global Entry | TSA PreCheck® and Global Entry are both Department of Homeland Security (DHS) Trusted Traveler Programs. |
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What You'll Learn

TSA PreCheck® eligibility
To be eligible for TSA PreCheck®, you must be a U.S. citizen, a U.S. lawful permanent resident, or a citizen of a partner country enrolled in Global Entry, NEXUS, or SENTRI. Canadian citizens who are members of NEXUS are also eligible.
If you are eligible, you must apply and get approval from the Transportation Security Administration (TSA). Most applicants receive their Known Traveler Number (KTN) in 3-5 days, though some applications can take up to 60 days. The KTN must be added when booking airline travel reservations to have the TSA PreCheck® indicator appear on your boarding pass. If you add your KTN after checking in, you will need to get a new boarding pass. The fee maintains your eligibility for five years.
Children under 17 do not need their own KTN if they are travelling with an adult who has TSA PreCheck. The TSA PreCheck indicator must appear on the adult's boarding pass, and the adult and child must be on the same airline reservation.
If you are a member of a CBP Trusted Traveler program, you will receive a 9-digit PASS ID, which is the same number for all CBP programs. This should be added in the KTN field when making airline reservations to ensure the TSA PreCheck® indicator appears on your boarding pass.
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KTN requirements
A Known Traveler Number (KTN) is issued to individuals approved to receive TSA PreCheck® expedited screening. The KTN must be added when booking airline travel reservations to have the TSA PreCheck® indicator appear on your boarding pass. If you add your KTN after checking in, you’ll need to get a new boarding pass.
If you apply directly through TSA, you’ll receive a Known Traveler Number (KTN). If you’re registered with a CBP program, you’ll receive a 9-digit PASS ID, which is the same number for all CBP programs. Update your KTN or PASS ID in your AAdvantage® account before you travel so your information is saved for every trip. If you’re not an AAdvantage® member, you must add your KTN or PASS ID to each reservation when you book.
For members approved for the TSA PreCheck® Application Program, this number is 9 or 10 digits long, can be a combination of numbers and letters and typically begins with TT for those who enrolled through IDEMIA, TE for those who enrolled through Telos, or AC for those who enrolled through CLEAR all of which are official TSA PreCheck® enrollment providers. For members approved for Global Entry, NEXUS, or SENTRI, the KTN is the CBP PASS ID number. This nine-digit number usually begins with 10, 13, 14, 15, 16, 50, 70, 80, 95, 98, or 99 and can be found on the back of your NEXUS, SENTRI, or Global Entry card in the upper-left corner or by logging on to the Trusted Traveler Programs website.
If your KTN is still active, confirm with your airline that your KTN, name, and date of birth are accurate. If you still do not have a TSA PreCheck® indicator on your boarding pass, or if you have questions concerning your TSA PreCheck® status, you can reach out to TSA through Twitter @AskTSA, Facebook Messenger, Apple Business Chat, or by texting "Travel" to AskTSA (275-872). You can also contact the TSA Contact Center at (866) 289-9673 or fill out an online form.
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Contacting TSA
If you need to get in touch with the Transportation Security Administration (TSA), there are several ways to do so.
Firstly, you can contact the TSA Contact Center at (866) 289-9673. You can also reach out to the TSA on social media via Twitter @AskTSA or Facebook Messenger (http://www.fb.com/AskTSA). Another option is to use Apple Business Chat or text "Travel" to AskTSA (275-872). Additionally, you can submit an online form on the TSA website.
If you have a question or concern about your Global Entry, NEXUS, or SENTRI membership, you can contact Customs and Border Protection at (877) 227-5511 or by email.
For travelers with disabilities, medical conditions, or other special circumstances who require additional assistance during the security screening process, TSA Cares is a dedicated helpline that can be reached by calling (855) 787-2227 or submitting an online form.
If you need to file a claim for lost or damaged property during the screening process, you can do so by contacting the TSA. However, it's important to note that screening at certain airports is performed by private companies and not the TSA. You can also contact the TSA to report suspicious activities or threats.
In the case of lost items at the security checkpoint, you can reach out to the TSA lost and found. For items misplaced elsewhere in the airport, the appropriate point of contact is the airport authority.
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TSA security measures
The Transportation Security Administration (TSA) employs a range of security measures to ensure the safety of travellers. These measures are unpredictable and can be both seen and unseen, beginning long before passengers arrive at the airport.
TSA works closely with intelligence and law enforcement communities to share information and adjust processes and procedures to meet evolving threats. They also rely on the public to report any suspicious activities, such as unattended baggage or individuals in possession of threatening items.
Passenger screening is a critical part of TSA's layered security approach. Screening procedures aim to prevent prohibited items and other threats from entering sterile areas of the airport. This includes screening approximately 3.3 million carry-on bags daily for explosives and other dangerous items. Passengers are required to remove personal electronic devices larger than cellphones from their carry-on bags for separate X-ray screening.
Additionally, TSA has implemented pat-down procedures to detect prohibited items or threats. These procedures may be used as part of unpredictable security measures or as an alternative to other screening methods. TSA officers advise passengers of the pat-down process, which may include inspection of sensitive areas, and sufficient pressure is applied to ensure detection.
TSA also offers an expedited screening program called TSA PreCheck®. Eligible travellers can speed up their screening process at participating U.S. airports and for most international trips. To enrol, individuals must apply and receive approval from TSA. Members of certain Customs and Border Protection (CBP) Trusted Traveller programs, such as Global Entry, SENTRI, or NEXUS, are also eligible for TSA PreCheck®.
TSA continues to adapt its security measures to balance safety and efficiency, especially during the pandemic, when staffing shortages and increasing passenger numbers have created challenges.
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TSA PreCheck® lanes
TSA PreCheck® is an expedited security program that allows eligible travelers to speed up their screening process at participating U.S. airports and for most international trips. To participate in TSA PreCheck®, you must apply and get approval from the Transportation Security Administration (TSA).
If you have TSA PreCheck®, you can go through a dedicated screening lane at the airport where you may not need to remove your shoes, jacket, belt, or laptop from your bag. TSA PreCheck® lanes are available at select airports and airlines. To use the TSA PreCheck® lanes, you must be traveling on an airline that has partnered with the TSA to offer this service. You can check the TSA PreCheck® airports and airlines map for a current list of participating airlines.
If you have a Known Traveler Number (KTN), you can add it to your airline reservations to ensure the TSA PreCheck® indicator appears on your boarding pass. The KTN must be added when booking your reservations, and it must be accurate along with your name and date of birth. If you add your KTN after checking in, you will need to get a new boarding pass. If you are a member of a Customs and Border Protection (CBP) Trusted Traveler program, such as Global Entry, NEXUS, or SENTRI, your KTN is the same as your CBP PASS ID number.
If you do not have a KTN or PASS ID, you can still use the TSA PreCheck® lanes if you are an AAdvantage® member and have opted in to use TSA PreCheck® Touchless ID. This allows you to verify your ID faster and easier. Children 17 and under can also join an adult with TSA PreCheck® when it appears on the child's boarding pass.
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Frequently asked questions
A Known Traveler Number (KTN) is issued to individuals approved to receive TSA PreCheck® expedited screening. The KTN must be added when booking airline travel reservations to have the TSA PreCheck® indicator on your boarding pass.
You must add your KTN in the KTN field when making airline reservations to ensure the TSA PreCheck® indicator appears on your boarding pass. If you add your KTN after checking in, you’ll need to get a new boarding pass.
Confirm with your airline that your KTN, name, and date of birth are accurate. If you still do not have a TSA PreCheck® indicator, you can reach out to the TSA via Twitter (@AskTSA), Facebook Messenger, Apple Business Chat, or by texting "Travel" to AskTSA (275-872).















