The Transportation Security Administration (TSA) said it has now screened more than two million travelers through the TSA Pre-Check prescreening initiative. TSA Pre-Check is currently available for U.S. citizens traveling in the United States who are members of U.S. Customs and Border Protection (CBP) Trusted Traveler programs and select frequent travelers of participating airlines at many of the busiest airports across the country.

TSA Pre-Check allows passengers to volunteer information about themselves prior to traveling domestically to expedite their checkpoint screening at participating airports. The initiative is part of TSA’s broader effort to implement risk-based concepts that enhance aviation security by focusing more on travelers the agency knows the least about and allowing known travelers the opportunity to expedite their travel through security checkpoints.

"As TSA Pre-Check continues to expand to additional airports and passenger populations, we are seeing exponential growth in participation," said TSA Administrator John Pistole. "We are on track to bring TSA Pre-Check to 35 airports by the end of 2012 and even more next year."

TSA Pre-Check is available at 19 airports and operational with five airlines, including Alaska Airlines, American Airlines, Delta Air Lines, United Airlines and US Airways. TSA said it will continue to add more airports and airlines to the highly acclaimed program.

Eligible passengers include U.S. citizens of frequent traveler programs on participating airlines and current members of CBP Trusted Traveler programs, including Global Entry, SENTRI and NEXUS. Individuals interested in participating can apply by visiting www.globalentry.gov.

As part of its broader risk-based security effort, TSA is in the process of testing and implementing several new screening concepts, which include an expedited screening program for flight crews, expanded behavior detection techniques, modified screening procedures for travelers 12 and younger and 75 and older, and expanding TSA Pre-Check screening benefits to U.S. military active duty members.