< PrevNext > 88. Aon London Share 2016 U.S.-Booked Air Volume: $51 million2016 Global Air Volume: $106 millionPrincipal Air Suppliers: Star Alliance, Oneworld, SkyTeam & JV partnersPrincipal Hotel Suppliers: Hyatt, Hilton, Marriott, AccorPrincipal Car Rental Suppliers: Avis, BudgetPrincipal Online Booking Tool: GetTherePrincipal Expense Supplier: Oracle PeopleSoftPrincipal Card Supplier: American ExpressConsolidated/Primary Global TMC: Carlson Wagonlit TravelAon's 2016 U.S.-booked air volume decreased five percent from $53.7 million in 2015. The risk, retirement and health solutions firm completed eight acquisitions totaling $879 million, according to its annual report. In the first quarter, it acquired Australian insurance, retirement and investment consulting firm Globe Events Management and Minneapolis-based talent analytics company Modern Survey. In the second quarter, Aon acquired New Zealand-based insurance brokerage firms Nexus Insurance Brokers and Bayfair Insurance Centre, as well as Univers Workplace Solutions, an elective benefits enrollment and communication services firm in New Jersey. In the third quarter, it acquired Cammack Health, a health and benefits consulting firm in New York. In the last quarter of 2016, Aon acquired global cyber-risk management firm Stroz Friedberg, hiring assessment firm CoCubes in India and Brazilian health and benefits brokerage solutions firm Admix. Despite the acquisitions, Aon maintained its 2016 headcount at 69,000, as it did the previous year.