An FBO is a commercial business that provides a range of services on the grounds of an airport. According to the National Air Transportation Association, FBOs have been operating in the United States for more than 100 years even longer than there have been scheduled passenger airlines. FBOs serve approximately 3,000 more U.S. airports that just the 500 or so which offer commercial airline service.
Today, FBOs provide a number of services for commercial aviation operators, but they are most often involved with fueling and aircraft maintenance. The list of other services offered by US-based FBOs is long and includes handling, aircraft, hangar services, and fueling. Additionally, many FBOs also provide technical services such as Maintenance, Repair and Overhaul (MRO) and Aircraft Charter & Management (ACM) to offer a streamlined experience for pilots, flight crew, and passengers.