As the smallest class of jet-powered aircraft, very light jets are suitable for one pilot and 4-6 passengers, and have a certified takeoff weight of 10,000 lbs (4,540 kgs.) or under.  This light weight sets them apart from other private jets, which tend to fall under the umbrella term of ‘business jets.’  Very light jets are also known as entry-level jets, VLJs, or personal jets, and were previously recognized as ‘microjets’ as well.  VLJs are intended to have lower operating costs than most business jets and the ability to take off and land on runways as short as 3,000 ft (914 m.).  They can be utilized either for point-to-point air taxi service or for personal use.  The Small Aircraft Transportation System (SATS) aims to provide service to areas that are not utilized by airlines and very light jets tend to make excellent aircraft to use toward this goal.  Examples of very light jets are the Eclipse 500, Embraer Phenom 100 and Citation Mustang.