Meredith Broder, an adviser with the Villanova, Pa., travel company Avenue Two Travel, said that empty leg flights have changed the private jet game. “Rather than have the plane fly empty, air companies or private jet brokers try to sell that route at a discount,” she said. “This strategy helps with fuel costs and puts private jet flying within reach to people who wouldn’t normally be able to afford this luxury and convenience.”
Charter, also called air taxi or ad-hoc flights require certification from the associated country's regulating body such as the FAA in the U.S. The regulations are differentiated from typical commercial/passenger service by offering a non-scheduled service. In the U.S. these flights are regulated under FAA Part 135. There are some cases where a charter operator can sell scheduled flights, but only in limited quantities.
Aircraft charter brokers have entered the marketplace through the ease of setting up a website and business online. Aircraft charter operators are legally responsible for the safe operation of aircraft and charter brokers require no economic authority and are largely unregulated. The Department of Transportation requires that air charter brokers disclose to the consumer that they do not operate aircraft and cannot use terms like "our fleet of aircraft", "we operate", "our charter service" and others.
No matter what company you're flying with, be sure to ask if there two pilots or one. (Though two pilots are standard on commercial flights, regulations vary for private planes of all sizes.) It also helps to ask if the operator owns the plane—typically, companies that own their planes offer better service. Never forget to ask about daily minimums and taxi fees. "If the hourly rate is $9,000 and you have a single 40-minute flight, you might assume you are going to pay $6,000," says Doug Gollan, creator of PrivateJetCardComparisons.com. "But if your provider has a daily minimum of 1.5 hours, you are going to actually be charged $13,500, plus taxi time, which in my comparisons I have found varies between being included and up to 12 minutes per segment."
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.