Privacy is one of the main advantages of a charter flight. Unlike a commercial flight, where travelers are herded through a crowded airport, having to undergo an intrusive security screening, passengers on a charter flight depart from a private facility known as an FBO. At most private airports, passengers can pull their cars right up to the plane.
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.