PHI Inc. (PHI) is engaged in the oil and gas exploration, development, and production industry, principally in the Gulf of Mexico. It is a provider of helicopter transportation services in the Gulf of Mexico. The Company also provides helicopter services to the oil and gas industry internationally, and to non-oil and gas customers and United States governmental agencies, such as the National Science Foundation. The Company operates in three segments: Oil and Gas, Air Medical, and Technical Services. The Company also provides air medical transportation for hospitals and emergency service agencies where it operates as an independent provider of medical services. At December 31, 2010, it owned or operated 256 aircraft domestically and internationally, 162 of which were dedicated to its Oil and Gas segment, 89 of which were dedicated to its Air Medical segment, and five of which were dedicated to other operations. On April 1, 2010, it purchased two heavy aircraft.