Aircraft leases are often used by private aircraft operators, as leases provide the same level of access to an aircraft that ownership provides, without the capital expenditure buying a business jet requires. Leases are offered in two main forms: wet leasing, normally used for short-term access; and dry leasing, typically used for longer term leases. Under wet leases, flight crews are provided in tandem with the aircraft, while operators of dry leased aircraft supply their own crews. Combination wet-dry leases may also be offered, as when an aircraft is wet leased to establish service, and once an in-house flight crew is trained, switched to a dry lease.
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.