In the United States, business aircraft may be operated under either FAR 91 as private operations for the business purposes of the owner, or under FAR 135 as commercial operations for the business purposes of a third party. One common arrangement for operational flexibility purposes is for the aircraft's owner to operate the aircraft under FAR 91 when needed for its own purposes, and to allow a third-party charter-manager to operate it under FAR 135 when the aircraft is needed for the business purposes of third parties (such as for other entities within the corporate group of the aircraft's owner).
Prospective aircraft buyers often look for private jets for sale by searching Google, gathering information on various makes & models and their performance characteristics, and on condition, age, price and other information about specific jets for sale. Most private airplane buyers use standard phrases like: "private jets for sale", "private jets on sale" or "private jets on market" for their search. Some prefer more specific terms that may include a manufacturer’s name along with the aircraft model number, and configuration features such as a particular upgraded avionics package. Searching for aircraft for sale online using very specific terms may miss some listings due to variations in identification, for example “Gulfstream G550” vs. “Gulfstream G-550.” More inclusive searches, such as “Gulfstream, large-cabin jet” yield more results.
On 1 April 2017, there were 22,368 business jets in the worldwide fleet, of which 11.2% were for sale. 5-year old aircraft residual value level is at a 56% of the list price. A new business aircraft depreciate by 50% in five years before depreciation flattens between years 10 and 15, and the owner of a 15 to 20 years old is often the last, matching luxury cars.