United Technologies Corporation is a large-sized company that provides products and services to the aerospace & defense and building systems industries. United Technologies is comprised of a number of businesses which include:
Otis: Elevators and escalators
Pratt & Whitney: Military and commercial aircraft engines
Sikorsky: Helicopters
UTC Aerospace Systems: Aircraft systems and components
UTC Climate, Controls & Security: Carrier heating, air-conditioning, fire and security products, and refrigeration systems