Sikorsky Aircraft Corporation is a world leader in the design, manufacture and service of military and commercial helicopters; fixed-wing aircraft; spare parts and maintenance, repair and overhaul services for helicopters and fixed-wing aircraft; and civil helicopter operations. A passion for aviation drove immigrant Igor Sikorsky to establish The Sikorsky Manufacturing Corporation in 1925 on Long Island, New York, and the company later became The Sikorsky Aviation Corporation. In 1929, Igor purchased land in Stratford, Connecticut, and the company became a subsidiary and later a division of United Aircraft Corporation, which evolved into United Technologies Corporation in 1975 (aerospace).