The Citation X made this category of private jets popular in the late 90's. Super mid-size jets seat up to 9 passengers comfortably, much as the mid-size, but can travel 3,500 miles with average cruising speeds from 490 to 490 mpg. Super medium jets reach an altitude 51,000 feet where maximum fuel efficiency is obtained, and where there is minimum air traffic. Interiors are custom designed and offer a variety of amenities, such as full service galleys. All have lavatories, and large cabin interiors with standing room with comfortable, luxury leather seats, retractable worktables, and access to baggage in-flight if needed. For long distance travel, where efficiency and comfort are desirable, super-mid jets are the perfect match.