PHI, Inc. is engaged in transportation of personnel to, from, and among offshore platforms for customers engaged in the oil and gas exploration, development and production industry. The Company offers these services in various domestic and international markets. Most of its offshore flight operations are concentrated in the Gulf of Mexico. The Company operates through three segments: Oil and Gas, Air Medical, and Technical Services. The Company also provides air medical transportation for hospitals and for emergency service agencies. In addition, it performs helicopter maintenance and repair services, primarily to existing customers that own their own aircraft. It owns or operates approximately 265 aircraft domestically and internationally, of which, over 155 belongs to its Oil and Gas segment, over 104 belongs to Air Medical segment and over six are in to other operations. Its principal customers are integrated energy companies and independent exploration and production companies.