For the occasional trip from JFK
You have to remember that acquisition costs for corporate jets typically pale in comparison to the operating expenses (mx, fuel, hull insurance, hanger, crews, crew training & benefits, power by the hour progs, etc.) over a period time.
If visions of grandeur are still eating away at you then do some googles on the aircraft you want to know about or have a peak here:
There are lots of options for corporate flying today, outright purchase being one of the less popular.