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'''The JA Ranch,''' founded jointly by John George Adair (1823-1885) and Charles Goodnight (1836-1929), is the oldest privately owned [[cattle]] ranch in the Palo Duro Canyon section of the Texas Panhandle]] southeast of [[Amarillo]], [[Texas]]. At its peak size in 1883, the JA, still managed by descendants of the Adair family, encompassed some 1,335,000acres of land in six counties and a herd of 100,000 cattle. The name "JA" is derived from the initials of John Adair, a [[business]]man, originally from [[Ireland]]. Goodnight managed and expanded the ranch, while Adair provided the working capital. Upon Adair's death, his wife, the former Cornelia Wadsworth Ritchie, took over Adair's interest in the JA. In 1888, Goodnight left the arrangement to establish his own ranch and in time ventured into other [[business]] activities as well. The ranch was added in 1966 to the [[National Register of Historic Places]] for Armstrong County.<ref>{{cite web|title=JA Ranch|url=http://atlas.thc.state.tx.us/viewform.asp?atlas_num=2066000807&site_name=J+A+Ranch&class=2001|publisher=Texas Historical Commission|accessdate=21 November 2011}}</ref>​