What does TSA stand for? It stands for the Transportation Security Administration, the federal agency that runs security checkpoints at airports across the United States. The officers who check your ID, scan your carry on bag and wave you through the body scanner work for TSA.
The agency was created by Congress in November 2001, after the September 11 attacks, to take airport screening out of the hands of private contractors hired by airlines. It became part of the Department of Homeland Security when that department was formed in 2003.
Quick facts
Stands for
Transportation Security AdministrationType
Initialism, said T S APart of
Department of Homeland Security (DHS)Started
Created by law in November 2001Seen at
Airport checkpoints, bag tags, travel websitesRelated terms
PreCheck, REAL ID, TSO, 3-1-1 ruleNot to be confused with
FAA, which handles air traffic and aircraft safety
What does TSA stand for in each of its three words?
Each word tells you something about the job. Transportation covers more than planes; the agency also has security roles for rail, transit, highways and pipelines, though airports are where most people meet it. Security is its mission: keeping weapons, explosives and other threats off vehicles. Administration marks it as a federal agency within a larger department.
The screeners themselves are called transportation security officers, or TSOs. Their uniforms and badges carry the TSA name.
What TSA does at the airport
- Checks identity. Officers compare your ID with your boarding pass or a digital record. Adults need an acceptable ID such as a REAL ID compliant license or a passport.
- Screens carry on bags. Bags go through X ray machines, and some are searched by hand.
- Screens passengers. Walk through metal detectors, body scanners and pat downs look for items not allowed on board.
- Screens checked luggage. Bags you check are scanned behind the scenes, and an inspection notice may be left inside if one was opened.
- Sets the rules for what you can bring, from liquids to tools to batteries.
TSA does not decide flight delays, ticket refunds or lost luggage claims. Those belong to the airline.
The 3-1-1 liquids rule and other checkpoint terms
Travelers often search the letters because of a packing question. A few terms tied to TSA:
- 3-1-1 rule: liquids in your carry on must be in containers of 3.4 ounces (100 milliliters) or less, all fitting in one quart sized bag, with one bag per traveler. Larger amounts go in checked bags, with some exceptions such as medicine and baby formula.
- TSA PreCheck: a paid program for approved travelers that offers a faster lane where you often keep shoes and light jackets on.
- TSA approved lock: a luggage lock that officers can open with a master key without cutting it.
On a travel checklist: "Toiletries in TSA size bottles." This means travel bottles of 3.4 ounces or less that meet the liquids rule.
How to say and write TSA
Say each letter: "T S A." Nobody pronounces it "tsah." The letters stay uppercase with no dots between them, and since T is spoken "tee," the article is "a": "a TSA officer." People also use it as a stand in for the checkpoint itself: "We got through TSA in ten minutes."
Why some short forms get spelled out while others are spoken whole: see what is an acronym.
TSA vs other agencies at the airport
| Letters | Agency | Role |
|---|---|---|
| TSA | Transportation Security Administration | Screens passengers and bags |
| FAA | Federal Aviation Administration | Air traffic control, pilot and aircraft safety |
| CBP | Customs and Border Protection | Checks travelers and goods entering the country |
| DHS | Department of Homeland Security | Parent department of TSA and CBP |
When you land from abroad, the passport check is CBP, not TSA. Immigration enforcement inside the country is handled by ICE. Dozens more agency names are decoded in our government acronyms section.
Questions people ask
Is TSA a government agency?
Yes. TSA is a federal body inside the Department of Homeland Security. A few airports use private screening companies under a TSA program, but they still follow TSA rules.
When was TSA created?
Congress created it in November 2001, in the months after the September 11 attacks. It moved into the new Department of Homeland Security in 2003.
What does TSA mean on a lock?
A TSA approved lock can be opened by security officers with a special key, so they can inspect a checked bag without breaking the lock.
What does TSA PreCheck mean?
It is a program for travelers who apply and are approved in advance. Members can use a faster screening lane at many airports.
How do you say TSA?
Spell out the letters: "T S A." Most people also use it as shorthand for the airport security line.