PHI Inc. (PHI) is a provider of helicopter transportation services in the Gulf of Mexico. It is engaged in the business of transportation of personnel and, to a lesser extent, parts and equipment, to, from, and among offshore platforms for customers engaged in the oil and gas exploration, development, and production industry, principally in the Gulf of Mexico. PHI is a provider of helicopter transportation services in the Gulf of Mexico. It operates in three segments: Oil and Gas, Air Medical, and Technical Services. It also provides helicopter services to the oil and gas industry internationally, and to non-oil and gas customers and the United States Governmental agencies, such as the National Science Foundation. PHI also provides air medical transportation for hospitals and emergency service agencies, where it operates as an independent provider of medical services. In addition, it performs helicopter maintenance and repair services , primarily to those that own their own aircraft.