Charter, also called air taxi or ad-hoc flights require certification from the associated country's regulating body such as the FAA in the U.S. The regulations are differentiated from typical commercial/passenger service by offering a non-scheduled service. In the U.S. these flights are regulated under FAA Part 135. There are some cases where a charter operator can sell scheduled flights, but only in limited quantities.
A public charter is one in which a tour operator rents the aircraft and advertises and sells seats to members of the public, either directly or through a travel agent. In the case of public charters, the flight must be filed with the U.S. Department of Transportation, and the tour operator must supply a charter prospectus. The tour operator also must assume a legal responsibility to provide the transportation service, and must abide by DOT requirements for the protection of the clients' money. Public charters often operate only seasonally, and are often sold as part of a vacation package deal, although spare seats may be offered at bargain prices.
Private charter flights offer a range of advantages for busy professionals, including time-efficiency. From quicker check-ins to faster transit times, private jet hire is the perfect way to fulfil multiple meetings in different cities, carry out several site visits in one day or simply have more of an opportunity to remain productive while travelling.