Conversely, the aircraft's residual value at the end of the lease is an important consideration for the owner. The owner may require that the aircraft be returned in the same maintenance condition (e.g. post-C check) as it was delivered, so as to expedite turnaround to the next operator. Like leases in other fields, a security deposit is often required.
At 102 in (259 cm), the G650ER has the widest cabin yet but should be joined by the Falcon 5X (a Global 5000/G500 competitor) and its replacement, and the 4,500 nmi (8,300 km) Citation Hemisphere in 2021; at 98 in (249 cm), the Global 7000/8000 is wider than the 95 in (241 cm) Global 5000/6000, the same as the Gulfstream G500/G600 and the Canadair Challenger, while the Dassault Falcon 8X is 92 in (234 cm) wide and the G450/G550 88 in (224 cm).
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.