Companies like Surf Air and FLITE Air Taxi can charge less than big-name competitors, in part, because they use different planes — like, for example, single-prop turbo planes — that cost less to operate because they use less fuel than larger jets. “The operational cost can be a fraction of other planes,” says Justin Hart, vice president of Surf Air memberships.
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.