PHI, Inc., together with its subsidiaries, provides helicopter transportation services to the integrated energy, and independent exploration and production companies primarily in the Gulf of Mexico and internationally. The company operates in three segments: Oil and Gas, Air Medical, and Technical Services. The Oil and Gas segment provides helicopter services to oil and gas exploration and production companies, and other offshore oil service companies primarily for routine transportation of personnel and equipment; transportation of personnel during medical and safety emergencies; and evacuation of personnel during the threat of hurricanes and other adverse weather conditions. The Air Medical segment provides air medical transportation services for hospitals and emergency service agencies in 17 states. The Technical Services segment offers helicopter repair and overhaul services for existing flight operations customers. It also operates 5 aircrafts for the National Science Foundation in Antarctica. As of December 31, 2011, it owned or operated 259 aircrafts, including 167 aircrafts by Oil and Gas segment, 86 aircrafts by Air Medical segment, and 6 for other operations. The company was formerly known as Petroleum Helicopters, Inc. and changed its name to PHI, Inc. in December 2005. PHI, Inc. was founded in 1949 and is based in Lafayette, Louisiana.