A private jet may seem an absurd expenditure to some people, but business people will find that being able to charter a jet at any time can be quite useful. Not only that, but the speed and privacy of it is unmatched, which allows these people to prepare presentations or conduct business meetings en route to an important destination. While it is possible to completely buy a private jet, most people use a jet car, which is much cheaper.
The common airport is typically a mobbed mess full of people that are impatient to get onto their flight. Not only that, but planes are commonly late and the entire experience is uncomfortable. With a private jet, owners can charter the plane at any time, so they do not have to go through this mess. Another benefit that most owners don't think of is the private jet's size. Since the jet is smaller than most commercial planes, it can land in many more airports. This means owners can find more convenient locations if closer airports are nearby.
Money is important to any businessperson, and time equals money. Chartering a private jet allows owners to fly much quicker. Instead of waiting hours to get onto the flight, waiting for everyone to get on and waiting for the plane to get ready for take off, the jet is prepped and ready. These planes are typically faster as well, so it is possible to reach destinations much faster. There are also no intrusive security checks, unlike with commercial planes, which makes everything that much quicker.
Flying in first class on a commercial plane may seem private, since there are less people, but it isn't quite enough to conduct any important business. With a private jet, the passengers are all alone. This means they can have or create presentations, have business meetings or talk about marketing plans without people overhearing them.