When the Dassault Falcon 7X (201.541.4747, www.dassaultfalcon.com) was introduced in 2005, it was a sensation because of its agility and handling. The jet’s three-engine configuration and wing design enable it to enter final approach at 120 mph, which is slow enough to land on runways as short as 2,000 feet. Thus it is the only aircraft in this category that can land at London’s convenient London City Airport. The 7X’s range (6,800 miles) and cabin length (39 feet) are less than those of other ultralong-range jets, but its engine efficiency enables it to burn 15 percent less fuel than its competitors. The 7X, which can reach a cruising altitude of 51,000 feet, is priced at about $52.8 million.