Clear Channel Outdoor, located in Torrance, Calif., is an airport advertising sales office for Clear Channel Outdoor, which maintains headquarters in Phoenix. The Torrance office is responsible for the sales of advertising space in and around the Zamperini Field Airport in Torrance. The Torrance office is a division of Clear Channel Airports, one of the leading airport advertising companies in the United States. CCA delivers more than one billion targeted advertising messages each year to airline passengers in the United States and Canada.