What TSA PreCheck does at the security checkpoint

TSA PreCheck lets you move through airport security faster by skipping some of the standard screening steps. If you have an active TSA PreCheck membership, you go through a dedicated PreCheck lane where you keep your shoes, belt, and light jacket on, leave your laptop and liquids bag in your carry-on, and walk through the metal detector instead of the body scanner. The whole process usually takes 5 to 10 minutes instead of 20 to 30.

You do not need to remove your shoes, empty your pockets completely, or take off your jacket — though TSA officers can still ask you to remove any of these if they want a closer look. Your ID and boarding pass still go through the scanner, and TSA still screens your carry-on bags the same way.

Key Takeaways

  • TSA PreCheck requires a Known Traveler Number (KTN) linked to your airline reservation before you check in for your flight.
  • You add your KTN during online check-in or at the airport kiosk, and it appears on your boarding pass as a TSA PreCheck indicator.
  • PreCheck lanes are available at most major U.S. airports, but not all airports have them, and availability varies by time of day.
  • Your TSA PreCheck membership lasts five years and costs $78 to $85 depending on where you renew it.
  • You must have a valid government ID to use PreCheck, and TSA officers can still conduct additional screening if they choose.

Getting your Known Traveler Number before your flight

Your TSA PreCheck membership comes with a Known Traveler Number (KTN), a nine-character code that tells the airline you are enrolled. You receive this number when your membership is approved, usually within three to five business days of your in-person appointment. Write it down or save it in your phone — you will need it every time you book a flight.

If you already have TSA PreCheck and cannot find your KTN, log into your account at the TSA PreCheck website (tsa.gov/precheck) and look under "My Account" or "Membership Details." You can also call the TSA PreCheck enrollment center at 1-855-347-8371 to have it sent to you by email or text.

Adding your KTN when you book or check in

The best time to add your KTN is when you book your flight. Most airline websites have a field for "Known Traveler Number" or "Frequent Flyer Information" — enter your nine-character KTN there. If you forget at booking, you can add it during online check-in, which opens 24 hours before your flight. Log into your airline account, find your reservation, and look for a section labeled "Add Known Traveler Number," "TSA PreCheck," or "find Flight Information."

If you miss online check-in, you can add your KTN at the airport kiosk when you check your bag or at the ticket counter. Tell the agent you have TSA PreCheck and provide your KTN. The agent will update your reservation, and your boarding pass will print with a TSA PreCheck indicator — usually a small "TSA Pre✓" logo or the letters "S" or "1" in a specific box.

Finding and using the PreCheck lane at security

When you arrive at the security checkpoint, look for a sign that says "TSA PreCheck" or "TSA Pre✓" — it is usually a separate lane next to the standard screening lanes. Show your boarding pass (which should display the PreCheck indicator) and your valid government ID to the TSA officer at the lane entrance. They will scan your boarding pass and wave you through.

In the PreCheck lane, you can keep your shoes, socks, belt, and light jacket on. Leave your laptop and liquids bag inside your carry-on — do not remove them. Place your carry-on and personal item on the conveyor belt, walk through the metal detector, and collect your bags on the other side. The whole process is streamlined because TSA has already vetted you.

Not every airport has a PreCheck lane, and some smaller airports may only have one during peak travel times. If you do not see a PreCheck lane, ask a TSA officer where it is. If your airport does not have one, you will go through standard screening even though you have PreCheck — you will not be charged or penalized.

What to do if your boarding pass does not show the PreCheck indicator

If your boarding pass does not display the TSA PreCheck logo or indicator, it means your KTN did not link to your reservation. This usually happens because you entered it incorrectly, the airline's system did not sync with TSA's database, or you checked in before the system updated. You can still try to use PreCheck, but you will need to tell the TSA officer at the lane entrance that you are enrolled.

Show the officer your boarding pass, your valid ID, and your TSA PreCheck membership card or a screenshot of your KTN from the TSA website. The officer can manually verify your enrollment in the TSA system and let you through the PreCheck lane. To avoid this in the future, double-check that your KTN is entered correctly — no spaces, no dashes — and add it at least 24 hours before your flight.

What you still have to do in the PreCheck lane

TSA PreCheck does not skip every security step. You still have to remove your watch, rings, and other metal jewelry and place them in a bin. You still have to remove your wallet, phone, and keys from your pockets. You still have to go through a metal detector or body scanner. TSA officers can still ask you to remove your shoes, jacket, or belt if they want to inspect them more closely.

Your carry-on bag is screened the same way as any other bag — TSA will still open it if something on the X-ray looks unclear. If you are traveling with a child under 12, they can go through PreCheck with you without removing their shoes. If you are traveling with someone who does not have PreCheck, they must go through standard screening.

Renewing your TSA PreCheck membership

TSA PreCheck membership lasts five years from the date of your in-person appointment. About six months before it expires, you will receive an email reminder. You can renew online through the TSA PreCheck website without another appointment — the renewal costs $78 to $85 depending on which enrollment center processes it. Your new KTN will be the same as your old one, so you do not have to update your frequent flyer accounts or airline reservations.

If your membership has already expired, you will need to schedule a new in-person appointment and pay the full enrollment fee. You cannot use PreCheck with an expired membership, even if you have the old KTN. Check your membership status on the TSA PreCheck website under "My Account" — it will show your expiration date.

Frequently Asked Questions

What if I lose my TSA PreCheck membership card?

Your KTN is what matters — the physical card is just a reference. You do not need to carry it. If you lose it, you can request a replacement from the TSA PreCheck website or call 1-855-347-8371. Your KTN stays the same, so you can keep using PreCheck when ready.

Can I use TSA PreCheck if I am traveling internationally?

TSA PreCheck only works for U.S. domestic flights. On international flights departing the United States, you go through standard security screening. When you return to the U.S., you can use PreCheck for your connection if you have time and the airport has a PreCheck lane.

What happens if I enter my KTN wrong when I book?

If you enter it incorrectly, your boarding pass will not show the PreCheck indicator. You can still tell the TSA officer at the checkpoint that you are enrolled, and they can verify you in their system manually. To fix it for future flights, update your airline frequent flyer profile with the correct KTN.

Do I need TSA PreCheck if I have Global Entry or another trusted traveler program?

Global Entry, NEXUS, SENTRI, and CANPASS all include TSA PreCheck benefits for domestic flights. You receive a KTN with those programs and use it the same way. You do not need to pay for TSA PreCheck separately if you already have one of these programs.

Can TSA officers deny me PreCheck even if my boarding pass shows the indicator?

Yes. TSA officers can pull you out of the PreCheck lane for additional screening at any time, for any reason. This is random and does not mean you did anything wrong. It happens occasionally to all PreCheck members.