< PrevNext > 18. Facebook Menlo Park, Calif. Share 2018 U.S.-Booked Air Volume: $175 millionPrimary U.S. Online Booking Tool: ConcurPrimary U.S. Expense Supplier: ConcurConsolidated U.S. TMC: CWTSocial media giant Facebook continued its rapid growth in 2018, and that’s reflected in its travel volume. BTN estimates Facebook’s U.S.-booked air volume increased by a double-digit percentage in 2018. Facebook—which owns Instagram, whatsapp and other tech platforms—saw revenue increase more than 37 percent to $55.8 billion. The company at the end of 2018 employed nearly 35,600 people, up from 25,100 one year prior. Facebook’s 2018 business travel generated 397,000 metric tons of carbon dioxide equivalent emissions, up from 246,000 in 2017. The company allows business class air travel on most international flights.