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.
Cessna simultaneously developed the Citation Mustang, a six-place twinjet (2 crew + 4 passengers), followed by the Embraer Phenom 100 and the Honda Jet. They have a maximum takeoff weight lighter than the FAR Part 23 12,500 pounds limit, and are approved for single-pilot operation. They typically accommodate 5-7 passengers over a 965 nmi average range, with a $3.6M mean price. Some VLJs such as the Eclipse and Mustang have no or limited lavatory facilities.
An affinity charter is slightly different in that, although all of the passengers are affiliated with a specific business, group or organization, each pays his own air fare. The passengers might sports or music fans traveling to a special event, or a bunch of friends going on vacation. With this type of charter, none of the seats can be sold to members of public.
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.