< PrevNext > 67. Omnicom Group New York Share 2018 U.S.-Booked Air Volume: $61 millionBTN estimates that marketing and communications firm Omnicom Group spent $61 million on U.S.-booked air travel in 2018, holding steady with the prior year. The firm reported that its salary and service costs, which include client-related travel costs alongside labor costs, rose 0.7 percent to $78.9 million in 2018. Revenue was $15.3 billion. Omnicom reported 70,400 employees globally at the end of 2018, down from 77,300 a year prior.