The Gulfsteam G4sp is the upgrade from the G4 and can seat up to 12 very comfortably.

https://centraljetcharter.com/learjet-55.html

"LEARJET 55, Private Jet!"

The series was to have three variants, the Learjet 54, 55 and 56 but only the Learjet 55 was built.


The Learjet 55 was a low-wing cantilever monoplane with NASA developed winglets, the winglets gave rise to the nickname Longhorn.


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The aircraft has a T-tail and is powered by two Garrett TFE731 turbofans mounted each side of the rear fuselage.


It has a retractable tricycle landing gear and an enclosed cabin for up to ten passengers and a cockpit for the two crew.


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Construction of the Learjet 55 began in April 1978 after extensive testing and work on the wing design which came, initially, from the Learjet 25.


The Learjet 55 first flew on 19 April 1979. The first production aircraft were produced starting 18 March 1981. 147 Learjet 55 aircraft were delivered.


The Learjet 55 is among the most popular midsize jets in the world. It employs state-of-the-art safety and navigation technologies, making it among the safest and most reliable in the industry.


In addition to safety, the aircraft features a stand-up cabin, well-appointed accommodations for seven, and generous range and versatility.


Mid-size corporate jet. In service since 1981. New fuselage development of Learjet 28/29 Longhorn.


A number of variants were produced: Learjet 55B with modified wings and digital flightdeck, Learjet 55C with delta fins and 55ER for extended range.


Production ceased in 1990 and changed to improved Learjet 60 in 1993. 147 aircraft were built, in 1999 140 remain in service mainly in Europe and North America.


At the 1977 Paris air show Gates Learjet announced details of its new Learjet 50 series.


This was intended to comprise the Learjet 54, Learjet 55 and Learjet 56 with longer and larger cabins.


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The first two were to seat up to 11 passengers and the last a maximum of eight.


All were to have advanced wings incorporating NASA-developed winglets and this last feature gave rise to the name Longhorn.


In fact, only the Longhorn 55 has been developed, construction of the first air frame starting in April 1978 after successful testing of anr Aerodynamic prototype of the wing on a Learjet 25.


The first of two Learjet 55 prototypes was flown initially on 19 April, 1979, and certification and delivery of the first production aircraft were recorded on 18 March 1981 and 30 April 1981 respectively.

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The Model 55 followed the same overall configuration as earlier members of the Learjet family.


It accommodated a crew of two on a separate flight deck and up to 10 passengers in the main cabin.


One of the major developments for this aircraft was the increased cabin space.


With up to 50 percent more cabin space, passengers can stretch out and enjoy their flight.


Instead of adding additional seating, designers at Learjet decided to leave the cabin open, to provide passengers with more comfort and amenities than previous aircraft designs.


With the evolution, the range was extended by almost 500 miles making it a near transcontinental mid-size aircraft.


Instead of adding additional seating, engineers created a high-density configuration that can seat ten.