Purchasing an aircraft is a significant investment. As with any major purchase, private aircraft buyers want to be sure they’re seeing all the available private jets for sale that meet their criteria, so that they can compare the price, configuration and condition of all such currently available private jets for sale worldwide. Moreover, many buyers who plunge into the market without the help of an expert advisor may not even have properly identified the best airplane for their needs, and a buyer can’t make a great deal on the wrong airplane.
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.