< PrevNext > 33. United Technologies Farmington, Conn. Share 2017 U.S.-Booked Air Volume: $111 millionPrincipal Hotel Suppliers: Hilton & MarriottPrincipal Car Rental Supplier: AvisPrincipal U.S. Online Booking Tool: ConcurConsolidated Global TMC: Amex GBTManufacturing and aerospace conglomerate United Technologies increased its U.S.-point-of-sale airline spend by nearly 7 percent in 2017. It renewed its contract with Avis and is wrapping up an airline RFP. Policy changes certainly could have impacted those negotiations; some United Technologies operating divisions like Pratt & Whitney aircraft engines, Otis elevators and Carrier HVAC and refrigeration decreased the threshold for business class use from flights of 12 hours to flights of six hours. Meanwhile, the acquisition of Rockwell Collins will add significantly to the company's airline volume. For online booking, the company is looking to consolidate to a global system. It has started using KDS Neo in Eastern Europe. United Technologies also is considering switching to Concur Expense.