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What TSA PreCheck Is and How It Works
TSA PreCheck is a United States government program that offers a faster security screening process at airport checkpoints. The program is managed by the Transportation Security Administration (TSA), a division of the Department of Homeland Security. When you participate in TSA PreCheck, you move through a separate security lane at participating airports, which typically takes significantly less time than standard screening.
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During standard airport security screening, travelers must remove shoes, belts, light jackets, and laptops or large electronics from their bags. TSA PreCheck members can keep these items on in many cases. You also keep your liquids bag in your carry-on luggage rather than removing it for separate inspection. These streamlined procedures can reduce your time in the security line by an average of 10 to 15 minutes.
The program operates at over 200 U.S. airports, including major hubs like New York's JFK, Los Angeles International, Chicago O'Hare, and Atlanta Hartsfield-Jackson. Not every airport has TSA PreCheck lanes, and availability can vary depending on time of day and airport traffic volume.
When you enroll in TSA PreCheck, you receive a Known Traveler Number (KTN), also called a TSA PreCheck number. This 10-digit number is tied to your name and date of birth in the TSA's system. You enter this number when booking flights with participating airlines, and it appears on your boarding pass. The TSA recognizes this number at security checkpoints and directs you to the PreCheck lane.
TSA PreCheck membership is valid for five years from the date your membership is approved. After five years, you must renew your membership to continue using the program.
Practical takeaway: Understanding how TSA PreCheck works helps you decide whether the program fits your travel habits. If you fly two or more times per year, the program may save you substantial time over a five-year period.
Understanding Your TSA PreCheck Number
Your TSA PreCheck number is a unique identifier that connects your physical identity to your membership status in the TSA PreCheck database. This 10-digit number is sometimes called a Known Traveler Number or KTN. It serves as proof that you have completed the enrollment process and background check required by the program.
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The TSA PreCheck number is not the same as your passport number, driver's license number, or any other form of identification. It is specific to the TSA PreCheck program and exists only in TSA databases. This number is what allows TSA officers at airport security checkpoints to verify your membership status in seconds, without needing to physically verify additional documents.
When you book a flight with a participating airline, you enter your TSA PreCheck number in the "Known Traveler Number" field during the booking process. Major airlines including American Airlines, Delta Air Lines, United Airlines, Southwest Airlines, and others participate in the program. The airline then prints your TSA PreCheck number on your boarding pass, typically in a special location where TSA officers can easily see it.
It is important to use the same name when enrolling in TSA PreCheck as the name on your government-issued ID and airline tickets. If your name differs between these documents, your KTN may not match your boarding information, and you could be sent to standard security screening instead of the PreCheck lane.
You can look up your TSA PreCheck number through the official TSA website. The TSA provides a lookup tool where you can search for your Known Traveler Number by entering your last name, date of birth, and other identifying information. This lookup tool is free to use.
Practical takeaway: Keep your TSA PreCheck number in a secure location, such as your email or a password manager, so you can quickly reference it when booking flights. Entering it correctly during booking is essential for receiving PreCheck benefits at the airport.
How to Find Your TSA PreCheck Number Online
The TSA operates an online lookup system that allows people to search for their Known Traveler Number without contacting the agency directly. To use this free tool, visit the official TSA website at tsa.gov. Look for the section labeled "Known Traveler Number" or "TSA PreCheck lookup."
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To search for your number, you will need to provide specific personal information. The system typically asks for your last name, date of birth, and sometimes your citizenship status. Some versions of the lookup tool also ask for the last four digits of your Social Security Number as a verification measure. Providing accurate information is critical—if your details do not match exactly what is in the TSA database, the system may not return results.
The lookup process is straightforward and usually takes less than one minute. After you enter your information, the system searches the TSA PreCheck database and displays your Known Traveler Number if your enrollment record exists. You can then save, screenshot, or write down your number for future reference.
It is common for people to forget their TSA PreCheck number, especially if they enrolled several years ago or do not travel frequently. The lookup tool exists specifically to help people retrieve this information without having to call the TSA or visit an enrollment center in person. The information you receive from the lookup tool is the same as what you originally received during your enrollment confirmation.
If you search for your number and the system does not return any results, this could mean several things: your enrollment may not have been completed, your membership may have expired, you may have enrolled under a different name, or you may have provided information that does not match your TSA database record. In these cases, you can contact the TSA by phone or visit the TSA website for additional information about your account status.
Practical takeaway: The TSA online lookup tool is the fastest way to retrieve your number. Save your number in multiple places—such as your email, phone contacts, or a travel folder—so you always have it when booking flights.
Information About TSA PreCheck Enrollment
TSA PreCheck enrollment involves a background check and an in-person appointment at a designated enrollment center. The program is not free—it costs $78 to $85 depending on where you enroll and which vendor processes your application. This fee covers a five-year membership. Most people pay this fee once every five years when they renew.
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The enrollment process begins online. You create an account on the TSA PreCheck website and provide personal information including your full name, date of birth, contact information, and Social Security Number. You also answer questions about your background and travel history. This information is used to conduct the background check.
After you create your online account, you schedule an in-person appointment at an enrollment center. These centers are located across the United States, often at airports, post offices, and dedicated TSA PreCheck enrollment facilities. During your appointment, a TSA representative or contractor will verify your identity using government-issued ID such as a passport or driver's license. They will take your fingerprints for a Federal Bureau of Investigation background check. The entire appointment typically lasts 10 to 15 minutes.
The background check includes searches through FBI criminal databases, immigration records, and other relevant law enforcement systems. The TSA reviews your information to determine whether you meet program requirements. Most people are approved within a few days to a few weeks. Once approved, the TSA assigns you a Known Traveler Number and sends you a confirmation email or letter.
Certain people may not be permitted to join TSA PreCheck. The TSA uses specific disqualifying factors to determine membership. These factors relate to security and safety concerns and are determined on a case-by-case basis by the agency. If you have questions about whether you would be permitted to enroll, the TSA website provides information about the program's membership requirements.
Practical takeaway: Understanding the enrollment process helps you plan ahead if you want to join TSA PreCheck. If you travel frequently and want to streamline your airport experience, enrolling makes sense financially and logistically. The cost breaks down to less than $17 per year for five years of faster airport security.
What Information You Need for the Lookup Process
To successfully use the TSA online lookup tool, gather the following information before you begin: your last name as it appears on your government ID, your date of birth, and your citizenship status. Some versions of the lookup tool may also request the last four digits of your Social Security Number. Having this information ready makes the process faster and more efficient.
This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.