(Featherlite), and cut limestone (Texas Quarries). It expanded its building products business in December 2000, when it acquired Benjamin Moore & Co. of Montvale, New Jersey. Moore formulates, manufactures, and sells architectural coatings that are available primarily in the United States and Canada. In 2001, Berkshire acquired three additional building products companies. In February, it purchased Johns Manville which was established in 1858 and manufactures fiberglass wool insulation products for homes and commercial buildings, as well as pipe, duct, and equipment insulation products. In July, Berkshire acquired a 90% equity interest in MiTek Inc., which makes engineered connector products, engineering software and services, and manufacturing machinery for the truss fabrication segment of the building components industry and is headquartered in Chesterfield, Missouri. Finally in 2001, Berkshire acquired 87 percent of Dalton, Georgia-based Shaw Industries, Inc. Shaw is the world's largest carpet manufacturer based on both revenue and volume of production and designs and manufactures over 3,000 styles of tufted and woven carpet and laminate flooring for residential and commercial use under approximately 30 brand and trade names and under certain private labels. In 2002, Berkshire acquired the remaining 12.7 percent of Shaw. On August 7, 2003, Berkshire acquired Clayton Homes, Inc. Clayton, headquartered near Knoxville, Tennessee, is a vertically integrated manufactured housing company. At year-end 2004, Clayton operated 32 manufacturing plants in 12 states. Clayton's homes are marketed in 48 states through a network of 1,540 retailers, 391 of which are company-owned sales centers. On May 1, 2008, Mitek acquired Hohmann & Barnard, a fabricator of anchors and reinforcement systems for masonry and on October 3 of that year, Mitek acquired Blok-Lok, Ltd. of Toronto, Canada. On April 23, 2010, Mitek acquired the assets of Dur-O-Wal from Dayton Superior. Flight services In 1996, Berkshire acquired FlightSafety International Inc. (or FSI), founded in 1951 by Albert Lee Ueltschi. FSI's corporate headquarters is located at LaGuardia Airport in Flushing, New York. It supplies high technology pilot training to aircraft operators in the fields of military, governmental, corporate, and regional or mainline flying. FlightSafety is the world's leading provider of professional aviation training services. According to its website, the company has 1,800 instructors and offers more than 4,000 individual courses for 135 aircraft types, using more than 320 flight simulators to serve customers from 167 countries. In 1998, Berkshire Hathaway acquired NetJets Inc., formerly Executive Jet Aviation. NetJets is the world's leading provider