Delta Airlines provides passenger transportation services to its passengers and cargo transport facilities to many businesses in the United States and worldwide. Delta Airlines works with both airlines and refineries. Georgia is the main hub for Delta Airlines. Delta Airlines sells tickets in many ways. These include online, through distribution channels, the fly delta app and reservations. Other airlines provide support for engineering and maintenance, repairs, tours, charters, and many other services. Delta Airlines has a 1,200-strong fleet.