The Transportation Security Administration announced Wednesday that it is expanding its Pre-Check screening service from 40 to 100 airports. Sea-Tac Airport, which already offers the expedited screening service, will get additional lanes and capacity by the end of the year.

Pre-Check allows pre-approved airline passengers to forego many of the standard screening measures and the long security lines. Pre-Check travelers can leave their shoes, belts and light outerwear on, keep laptops in their cases and keep those 3-1-1 compliant liquids and gels in a bag in their carry-on.

Eligible travelers will have a special indicator embedded in the barcode of their boarding passes so security knows they have been cleared. However, the TSA says expedited screening is not guaranteed and that they will do random, unannounced checks.

Eligible passengers include U.S. citizens who are part of frequent traveler programs for these airlines:

American citizens who are part of U.S. Customs Trusted Traveler program and Canadian citizens who are members of the NEXUS program also qualify. The TSA said it will launch an application process later this year to allow more people to possibly qualify.

The TSA says more than 15 million people have taken part in the service since it began nearly two years ago.

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