United Technologies Corporation (UTC) provides high technology products and services to the building systems and aerospace industries across the world. The Company operates through five segments: Otis; UTC Climate, Controls & Security; Pratt & Whitney; UTC Aerospace Systems and Sikorsky. Otis designs, manufactures, sells and installs a range of passenger and freight elevators for low-, medium- and high-speed applications, as well as a line of escalators and moving walkways. UTC Climate, Controls & Security is a provider of heating, ventilating, air conditioning (HVAC) and refrigeration solutions. Pratt & Whitney segment supplies aircraft engines for the commercial, military, business jet and general aviation markets. UTC Aerospace Systems is a global provider of technologically advanced aerospace products and aftermarket service solutions. Its Sikorsky segment manufactures military and commercial helicopters and also provides aftermarket helicopter and aircraft parts and services.