Ultimately, screening of passengers was implemented at fifteen additional airports, including Houston George Bush Intercontinental Airport, Dallas-Fort Worth International Airport, San Diego International Airport, Seattle-Tacoma International Airport, Honolulu International Airport, Anchorage Ted Stevens International Airport, Minneapolis-Saint Paul International Airport, Detroit Metropolitan Airport, Miami International Airport, Washington Dulles International Airport, Philadelphia International Airport, Newark Liberty International Airport, Boston Logan International Airport, El Paso International Airport, and the Luis Muñoz Marín International Airport in San Juan, Puerto Rico.