Delta Air Lines, Inc. provides scheduled air transportation for passengers and cargo throughout the United States and around the world. The Company's operates through segments, including Airline Segment and Refinery Segment. The Airline segment is managed as a single business unit that provides scheduled air transportation for passengers and cargo throughout the United States and around the world and other ancillary airline services. The Refinery Segment produces gasoline, diesel and jet fuel. Its wholly owned subsidiaries, Monroe Energy, LLC and MIPC, LLC operate the Trainer refinery and related assets located near Philadelphia, Pennsylvania. The Company also offers cargo services, aircraft maintenance, repair and overhaul (MRO), staffing services for third parties, vacation wholesale operations and private jet operations.