Most business people prefer charter jets because they can use the flight time to be more productive. If you have the entire plane to yourself, you can hold meetings, discuss business deals, and complete pending paperwork while you're thousands of feet off the ground.
If you are familiar with commercial aircraft, you may have rushed to the airport based on your timetable. If you arrive at the gate a few minutes before departure, you will not be boarding the plane. However, you can arrive at for your private jet flight 10 minutes before your scheduled departure.