Pricing for jet cards varies by provider and by the size of aircraft. Some providers quote prices that include fuel fees and others quote prices that exclude fuel fees so make sure to ask about all aspects so that you are comparing apples to apples. See this article for a detailed comparison of jet cards and all the factors to consider.
The major fractional providers and large fleet operators, such as NetJets, Flexjet and Wheels Up provide time on their own fleets to their jet card and membership holders. So generally with these companies you'll be flying on an aircraft that they own, manage and control. They also tend to be newer aircraft. The charter companies jet card holders fly on aircraft selected by the charter company, but these companies typically do not own or operate their own aircraft.
Light Jets
For a typical 25 hour jetcard on a light jet the prices are in the range of $150,000 to $200,00 range. For example the Air Partner price for 25 hours on a light jet is $160,000 including FET and fuel, with additional discounts available for return trips. NetJets price on the Phenom 300 starts at about $205,000 and this includes fuel fees but excludes any fuel surcharges or FET.
Mid Jets
At NetJets a 25 hour jet card on a Citation Latitude starts at about $250,000 plus FET and any fuel surcharges need to be added. At Flexjet the pricing is quite similar to NetJets. Air Partner charges $192,500 for 25 hours on their mid size JetCard which offers model year 2000 or newer aircraft. These include FET and all fuel charges.
Heavy Jets
NetJets price for 25 hours on a Gulfstream G450 is about $400,000 and includes basic fuel charges, but FET and any fuel surcharges are extra. Sentient Jet has an hourly price of $12,180 for heavy aircraft in their "SJ25+" program and includes fuel and FET.
In comparing any jet card pricing, make sure you are comparing apples to apples. Different providers include or exclude different charges in the main, headline prices they quote. Other features also differ from provider to provider, including the age and type of the aircraft, call out times, discounts for round trips and termination and refundability. Another area of difference is the number of peak days in the card program. These can vary from under 20 to over 50, and some companies charge extra for peak day travel and for most they require extra notice to book an aircraft.
Detailed comparisons, including pricing information, for the leading jet card and membership providers is available through a service on SherpaReport.