In the early 2000s, a national and international recession combined with the after effects of the September 11, 2001 terrorist attacks to depress the aviation sub-sector in and around Wichita. Orders for new aircraft plummeted, prompting Wichita's five largest aircraft manufacturers, Boeing Co., Cessna Aircraft Co., Bombardier Learjet Inc., Hawker Beechcraft and Raytheon Aircraft Co.—to slash a combined 15,000 jobs between 2001 and 2004. In response, these companies began developing small- and mid-sized airplanes to appeal to business and corporate users. In 2007, Wichita built 977 aircraft, ranging from single-engine light aircraft to the world's fastest civilian jet; one-fifth of the civilian aircraft produced in United States that year, plus numerous small military aircraft. In early 2012, Boeing announced it would be closing its Wichita plant by the end of 2013, which paved the road for Spirit Aerosystems to open its plant.