How a Known Traveler Number Works With TSA Gateside

TSA now lets some people with a Known Traveler Number apply to visit an airport gate without buying a plane ticket. Its Gateside by TSA PreCheck program uses a credential many travelers already enter when booking flights. For someone trying to meet a parent at the gate, that sounds wonderfully simple. Airports, naturally, have added a few steps between sounds simple and walks through security.

The TSA description of Gateside says people who enjoy PreCheck benefits can use their KTN to apply, then use a PreCheck lane if approved. The program is free to use. At launch, it covered 13 airports, including Los Angeles International, Detroit Metropolitan and San Diego International. It lets approved visitors enter the secure terminal without a boarding pass to meet someone, see them off or spend time beyond the checkpoint. They still go through screening.

That gives the KTN a second job. On a flight, it helps connect an eligible traveler to a PreCheck designation on a boarding pass. For Gateside, it helps connect an eligible person to an application for a visit. Neither route works by waving the number at a checkpoint like a backstage laminate. The useful question is what has to happen after you supply it.

The Number Starts the Process

A Known Traveler Number, or KTN, identifies someone approved for a participating trusted-traveler program. TSA PreCheck and Global Entry members receive one. Global Entry includes PreCheck benefits; its membership also addresses entry into the United States after international travel. The number comes through the federal trusted-traveler system, rather than from an airline's frequent-flyer program.

When you buy a flight, add the KTN to your airline profile or reservation, usually in a field labeled Known Traveler Number or secure traveler information. Then check the boarding pass for the TSA PreCheck designation. If the number is sitting in an account with a different airline, it will not magically appear on this booking. A frequent-flyer login and a federal trusted-traveler credential are separate bits of travel admin, however much they all look like random characters you copied into a notes app.

Lost the number? The Points Guy's KTN guide identifies the membership number or PASSID in a federal trusted-traveler account as the number to use. It also points Global Entry cardholders to the PASSID on the back of their card. Those are better places to look than guessing from an old flight confirmation. If your boarding pass lacks the PreCheck designation, checking the reservation's KTN field is a practical first move; having a number on file somewhere does not tell you what appeared on the booking in front of you.

The economics depend on what you already have. Gateside adds no pass charge, but it is aimed at people who already qualify for PreCheck benefits. If you are considering paid trusted-traveler membership principally to make one gate visit, check whether your airport has another visitor option before treating that membership as the admission price. If you fly regularly or return from international trips, those programs have uses beyond this visit. Your travel patterns, rather than a free Gateside application, should drive that decision.

A Gate Visit Has Its Own Approval Step

Gateside requires an advance application, submitted one to three days before the planned visit, according to the program details reported by Yahoo Creators. An applicant supplies their information and KTN, selects a participating airport and date, and checks the portal for approval before leaving for the airport. Airports have daily visitor limits, and availability can tighten during busy periods. An eligible person may therefore fail to get a pass for the day they want.

Adults seeking to visit on their own must qualify individually. A companion's PreCheck membership does not give them an automatic way through. The reported rules allow an eligible parent or guardian to add children to a Gateside registration, provided the children appear on the approved registration. Visitors should bring acceptable identification and their approval information to the checkpoint. A Gateside pass permits a visit through screening; it does not let its holder board a flight.

A September 18 visit at LAX shows why saving the confirmation somewhere accessible is more useful than memorizing your KTN. In a first-person account published by One Mile at a Time, a traveler said he applied with his son to meet his wife. He found their approval in the portal the next day. At the PreCheck checkpoint, an agent cleared him but asked a supervisor for help with his son's entry. Opening the confirmation to display both names resolved the question, he wrote, and both went through. That is one family's early experience, not a prediction of how long your airport's checkpoint will take. It does show the practical value of being able to display the approved registration, including everyone on it.

Why the Gate Needs a Pass at All

Before the September 11, 2001 attacks, people without tickets could generally pass through screening to see travelers off or welcome them at the gate. Afterward, access beyond checkpoints became largely limited to ticketed passengers and authorized people, while exceptions remained for people assisting travelers with certain needs. That broad change in access explains why Gateside is an application for a screened visit rather than a return to open gate access. The history does not point to one neat rule that flipped at every airport on the same day.

There is another precedent closer to home: airports including Detroit and San Diego have offered their own visitor-pass programs. Both approaches allow approved people without tickets into secure terminal areas. Gateside's defining additional condition is existing PreCheck eligibility, verified through the trusted-traveler system, alongside its TSA application. The airport-run programs illustrate that a visitor pass need not depend on the same membership route. Their eligibility and availability rules may differ, so a local pass is an option to investigate, rather than a guaranteed substitute.

TSA's approach has an understandable logic. It can offer a new visit to people already enrolled in an expedited-screening program, while still requiring an application, an available slot and checkpoint screening. That also limits who benefits from the free pass: the person who would most value walking a relative to the gate may have no PreCheck eligibility, even if the relative does. Local programs may provide another route at some airports, but the existence of a pass at Detroit or San Diego says nothing about what is available at your own terminal on your date.

For a flight, put the KTN on the reservation and check the boarding pass. For a Gateside visit, check that your airport participates, apply in the stated window and confirm approval before setting out. The number identifies your starting position in each process. It does not reserve a place beside the gate.