< PrevNext > 8. Boeing Chicago Share 2017 U.S.-Booked Air Volume: $227 millionAircraft manufacturer and defense contractor Boeing's U.S.-booked air spend increased by just under 4 percent in 2017. Boeing operates an Airlines Reporting Corp.-accredited Corporate Travel Department. In recent years, the company has implemented and updated agency robotic process automation tools for the CTD. Company employees in the U.K. in 2017 increased their use of remote conferencing options including videoconferencing, along with ridehailing and public and alternative transportation, helping to reduce business travel mileage by more than 25 percent. Boeing's 2017 revenue declined about 1 percent to $93.4 billion. The company at the end of 2017 employed about 140,800 in more than 65 countries, including the U.S., down from about 150,500 one year prior.