< PrevNext > 20. Google Mountain View, Calif. Share 2016 U.S.-Booked Air Volume: $159 millionConsolidated Global TMC: Carlson Wagonlit TravelGoogle's U.S.-booked air volume increased 13.6 percent year over year to $159 million. The tech giant's revenue has continued to grow, as parent company Alphabet reported $90.3 billion for 2016, up more than 20 percent compared with the previous year. Alphabet reported more than 72,000 employees at the end of 2016. For nearly a decade, Google has been a pioneer in the open booking approach, in which travelers get a budget for their itineraries, arrange travel and, if they come in under budget, reserve the difference for future trips. Even so, Google has consolidated its program globally through Carlson Wagonlit Travel and maintains preferred supplier perks and upgrades that employees can bid on with those surplus credits.