Clear Channel Outdoor Holdings Inc is one of the world's largest outdoor advertising companies. The company is engaged in providing advertising opportunities through billboards, street furniture displays, transit displays, and other out-of-home advertising displays for its clients. Its reportable segment includes America; Airports; Europe-North and Europe-South. The company generates maximum revenue from the America segment. The America segment serves markets throughout the U.S., with over 90% of its revenue generated from billboard displays.