The Transportation Security Administration (TSA) is an agency of the U.S. Department of Homeland Security that has authority over the security of the traveling public in the United States. The TSA's Precheck Program allows selected members of the American Airlines, Delta Air Lines, United Airlines, Alaska Airlines, Hawaiian Airlines, Virgin America, Southwest Airlines, Air Canada, JetBlue Airlines, and Sun Country Airlines frequent flyer programs, members of Global Entry, NEXUS, and SENTRI and active duty members of the US military to receive expedited screening for domestic and select international itineraries. read more