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.

JetSmarter, around since 2013, is an example of a player in the private aviation space selling shared flights. The company operates on a membership model: Fliers pay a minimum of $15,000 a year and book seats on already scheduled flights through the JetSmarter app, which lists more than 150 domestic and international trips a day. Trips under three hours are included in the cost of the membership while longer ones are an average of $300 a person, according to Sergey Petrossov, the company’s chief executive officer; most flights have an average of eight to 10 passengers.
Meredith Broder, an adviser with the Villanova, Pa., travel company Avenue Two Travel, said that empty leg flights have changed the private jet game. “Rather than have the plane fly empty, air companies or private jet brokers try to sell that route at a discount,” she said. “This strategy helps with fuel costs and puts private jet flying within reach to people who wouldn’t normally be able to afford this luxury and convenience.”
Though the early Lockheed Jetstar had four, most production business jets have two jet engines, mostly rear-mounted podded engine. If mounted below their low wing, it wouldn't allow sufficient engine clearance without a too long landing gear. The HondaJet is the exception with its over the wing engine pods. Dassault Falcon still builds three-engine models derived from the Falcon 50, and the very light jet market has seen several single-engine design concepts and the introduction of the Cirrus Vision SF50 in 2016.
×