A business jet, private jet, or bizjet, or simply B.J. is a jet aircraft designed for transporting small groups of people. Business jets may be adapted for other roles, such as the evacuation of casualties or express parcel deliveries, and some are used by public bodies, government officials or the armed forces.

Classes
The business jet industry groups these jets into five loosely-defined classes:

Heavy jets:
This is the most expensive type of private jet, as it provides the greatest space and capabilities. These aircraft, sometimes referred to as Bizliners (contraction of Business Airliners), are based on or converted from airliner types.

Super mid-size jets:
Super mid-size jets feature wide-body cabin space, high-altitude capability, speed, and ultra-long range. These jets combine transatlantic capability with the speed and comfort of a wide-body, high-altitude aircraft.

Mid-size jets:
These aircraft are suitable for longer-range travel such as transcontinental flights and for travel with larger passenger capacity requirements.

Light jets:
Light jets have been a staple of the business jet industry since the advent of the Learjet 23 in the early 1960s. They provide access to small airports and the speed to be an effective air travel tool.

Very light jets:
Very light jets, also known as Microjets or VLJs, are designed to provide air travel, for example, to the more than 5,000 small community airports in the United States.VLJs are defined in the industry as having a maximum takeoff weight of not more than 10,000 pounds.