Cessna Citation II  The Cessna Citation II (Model 550) series of Citation jets are light corporate jets built by Cessna. Stretched from the Citation I, it was announced in September 1976, first flew on January 31, 1977 was certified in March 1978. The "II/SP" is a single pilot version, the improved "S/II" first flew on February 14, 1984 and the "Citation Bravo" upgraded with new avionics and P&WC PW530A turbofans on April 25, 1995, while the United States used it as the "T-47". Production ceased in 2006 after 1184 were delivered. The Citation II (Model 550) stretches the Citation I fuselage by 1.14m (3ft 9in), increasing seating capacity to 10 and baggage capacity. Wingspan was increased, its larger fuel capacity and more powerful, Pratt & Whitney Canada JT15D4 engines provided higher cruise speeds and longer range. The stretched Citation was announced in September 1976, it first flew on January 31 1977 and FAA certification was awarded in March 1978, the II/SP is the single pilot version. A total of 688 aircraft were delivered. The improved Citation S/II (Model S550) was announced in October 1983 and first flew on February 14, 1984, before certification in July. It gained a supercritical airfoil developed for the Citation III and JT15D4B turbofans. It replaced the II from 1984, but the II resumed production from late 1985, and both were built until the Bravo introduction. Deliveries of the S/II amount to 160. The improved JT15D-4B has higher temperatures components, allowing more thrust at higher altitudes. It could seat 11 people and fuel capacity was increased to 5820 lbs. TKS fluid de-icing was used on airfoils leading edges in addition to bleed air for the engines. By 2018, 1970s-1980s model IISPs were valued at $300,000-700,000. The Citation Bravo first flew on April 25, 1995, was granted certification in August 1996 and was first delivered in February 1997. It features new P&WC PW530A turbofans, modern Honeywell Primus EFIS avionics, a revised Citation Ultra interior and a trailing link main undercarriage. Production of the Bravo ceased in late 2006 after 336 had been delivered. Its more efficient PW530A generates 15% more thrust at takeoff and 23% more at altitude.