And FLITE Air Taxi offers a la carte private plane flights for reasonable rates: A flight from Boston to Saratoga, N.Y. costs $541 per person (you will need six people to fill the plane, so $3,250 for the whole flight), as does one from New York City to Martha’s Vineyard and from Block Island to Worcester, Mass.; this does not include federal excise taxes (7.5% of the cost of the flight) but does include other fees.
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.