where they began flight testing. The VK-30 was introduced at the 1987 EAA Oshkosh Convention and first flew on 11 February 1988. Kit deliveries commenced shortly thereafter. 1990s Cirrus began designing the ST-50 under contract to Israeli aircraft manufacturer IsrAviation in the early 1990s. The aircraft was configured like the Cirrus VK-30 but powered by a Pratt & Whitney Canada PT6-135 turboprop engine, in place of the piston engine used in the VK-30. The prototype was first flown on 7 December 1994 by Norman E. Howell. Earlier that year, the Klapmeier brothers moved company headquarters from southern Wisconsin to a much larger facility at the Duluth International Airport in Duluth, Minnesota, bringing 35 employees with them and hiring another 15 at once. In August 1996, Cirrus announced plans to build a plant at the Grand Forks International Airport in Grand Forks, North Dakota. By the middle of the decade the company had discontinued the VK-30 and began development of the Cirrus SR20, which was first flown on 21 March 1995 and type certified on 23 October 1998. This was followed by customer deliveries of the SR20 beginning in July 1999. 2000s In June 2000, the company received an FAA Production Certificate for its SR20 aircraft. On 30 November of that year, Cirrus received a type certificate for its next model, the Cirrus SR22, which began deliveries in 2001. In August 2001, Cirrus sold 58% of the company for $100 million to Crescent Capital, the U.S. arm of the First Islamic Investment Bank of Bahrain (now called Arcapita). In July 2002, the company announced that it would collaborate with the University of North Dakota Aerospace Foundation to provide a new Cirrus Customer Training program. In February the following year, Cirrus delivered the industry's first-ever all glass cockpit light aircraft, sparking a major transition in general aviation, whereby over 90% of all new light aircraft by the year 2006 were equipped with glass cockpits. In June 2004, Cirrus received type certification for the SR20 from the European Aviation Safety Agency (EASA). That same year, Cirrus accomplished record-breaking sales, up 69% over the previous year. The SR22 became the world's best-selling general aviation aircraft. Cirrus entered the civilian flight-training fleet market with SR20 deliveries to Sweden's Lund University in January 2005, followed by Western Michigan University in September of that year. In 2006, the company delivered 721 aircraft (its most in a single