< PrevNext > 75. Marsh & McLennan Cos. New York City Share 2017 U.S.-Booked Air Volume: $55.6 million2017 Global Air Volume: $112.1 million2017 U.S. T&E: $130 million2017 Global T&E: $245 millionPrincipal Air Suppliers: Delta & UnitedPrincipal Hotel Suppliers: Marriott, Hilton & AccorHotelsPrincipal Car Rental Suppliers: Hertz & NationalPrincipal U.S. Online Booking Tool: GetTherePrincipal Global Expense Supplier: OraclePrincipal Payment Supplier: American ExpressPrimary U.S. TMC: BCDConsolidated Non-U.S. TMC: BCDIn 2017, 58 percent of Marsh & McLennan's U.S.-booked air volume was for domestic travel. The company estimates a slight uptick in U.S.-booked air volume to $56 million for 2018. Marsh & McLennan focused on travel cost containment and increasing compliance with the travel management company, corporate card and preferred travel suppliers. The company also optimized its hotel program relationships by moving to multiyear agreements. In 2018, it will focus on traveler communications and engagement. The company also is looking to streamline travel processes. Its corporate card program is individual bill/individual pay. The firm had $14 billion in revenue in 2017.