< PrevNext > 25. United Technologies Farmington, Conn. Share 2018 U.S.-Booked Air Volume: $137 millionPrimary Car Rental Supplier: AvisUnited Technologies’ diverse business portfolio—the contractor and conglomerate manufactures aircraft engines, elevators, escalators and other products for both the consumer and military markets—generated $66.5 billion in revenue in 2018, up 11 percent from 2017. Meanwhile, it’s U.S.-booked air volume increased 10 percent from 2017’s $124 million. The company expects the figure to rise 9 percent this year. It’s primary U.S. travel management companies are American Express Global Business Travel and BCD Travel.Major changes are underway at UTC, the parent company of Pratt & Whitney aircraft engines and Otis elevators, among others. In November 2018, it closed a $30 billion deal to acquire aerospace tech firm Rockwell Collins and subsequently announced plans to split into three companies. UTC in June 2019 announced plans to merge with fellow CT 100 defense contractor Raytheon in a deal worth more than $100 billion. The separation of the Otis elevator and the Carrier HVAC and refrigeration units into stand-alone businesses is expected to take place in 2020, before any merger of UTC and Raytheon. UTC set a corporate goal in 2015 to reduce its greenhouse gases emitted as a result of business travel 15 percent by 2020. The company tallied about 103,500 metric tons of carbon dioxide equivalent due to business air travel and car rentals in 2017, the most recent figure available. That’s about 6 percent lower than its 2015 figure, putting it on track to meet the goal. Net sales increased about 11 percent in 2018 to $66.5 billion. The company had 240,200 employees at year-end, up from 204,700 a year earlier, reflecting the addition of 30,000 Rockwell Collins employees.