< PrevNext > 87. WPP London Share 2015 U.S.-Booked Air Volume: $52 millionConsolidated Global TMC: BCD TravelMultinational advertising and public relations company WPP’s air travel, measured in miles, increased 5 percent in 2015. Per employee, air travel rose 1 percent, while WPP also increased its headcount of permanent employees 23 percent to 124,930. Revenue increased 6.1 percent. BTN estimates WPP spent $52 million on U.S.-booked air volume in 2015. The company uses audio- and videoconferencing to replace some face-to-face meetings. In 2015, it added 43 videoconferencing units, bringing its total to more than 700 in 160 cities. Use of those systems increased 6 percent year over year in 2015. WPP also offsets all its carbon emissions from air travel via “support of renewable energy generation projects in fast-growing economies,” according to its annual report.