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.
Charter operators own or manage private jets for multiple clients. Like traditional flight departments, charter companies handle all aspects of aircraft operation and maintenance. However, they are not aligned with just one corporation. They manage aircraft for a private owner or corporation and also handle the sales of available flight time on the aircraft they own or manage. Maintenance services can also be provided which typically include on-site or mobile repair, major and minor routine inspections, troubleshooting assistance away from base, avionics installation and repair, jet engine and battery service, interior modifications and refurbishment, Inspection Authority (IA) qualified inspectors, aircraft planning and budgetary projections, compliance with service bulletins, aircraft storage management, record keeping and management, technical appraisal of private jet purchases, leases and lease terminations, and Part 91 or Part 135 conformity inspections.
Lastly, don't be afraid to ask about safety: Any reputable operator should have safety information prominently featured on their website, and won't mind answering questions about their pilots, such as how many hours they have flown. (At least 250 hours, which is what it takes to get a commercial license; NetJets mandates at least 2,500 hours; Wheels Up, mandates 7,000 hours for a captain and 4,000 for a first officer.) Gollan suggests fliers ask if the pilot has any health issues, and feel free to ask if the operator (or plane itself) have any accidents or incidents in its history.