Under American and British accounting rules, a finance lease is generally defined as one in which the lessor receives substantially all rights of ownership, or in which the present value of the minimum lease payments for the duration of the lease exceeds 90% of the fair market value of the aircraft. If a lease is defined as a finance lease, it must be counted as an asset of the company, in contrast to an operating lease which only affects the company's cash flow.
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According to Jahid Fazal-Karim, owner and chairman of the board of Jetcraft, the sweet spot for buying a plane is between three and five years old in terms of value. Fazal-Karim knows what he is talking about, having overseen more than 500 transactions worth over $10 billion in value since he started his career at Jetcraft in 2008. He is often referred to as one of the most powerful players in business and private aviation. Jetcraft
Privacy is one of the main advantages of a charter flight.  Unlike a commercial flight, where travelers are herded through a crowded airport, having to undergo an intrusive security screening, passengers on a charter flight depart from a private facility known as an FBO.  At most private airports, passengers can pull their cars right up to the plane.
Because a charter flight is not part of a scheduled service, the flight will depart when you want it to.  You are also able to choose which cities you fly to and from.  Charter Flights are particularly convenient when you need to travel to a city where scheduled airline service may require multiple connections or layovers before you reach your destination.
On 1 April 2017, there were 22,368 business jets in the worldwide fleet, of which 11.2% were for sale.[5] 5-year old aircraft residual value level is at a 56% of the list price.[6] 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.[7]