This duo of Convairs saw service with Prinair during the early 1980s, but had been withdrawn from use for more than 4 years when this photo was taken. The one in front, N771PR, is special: it is the Convair 580 prototype, converted from a Convair 340 in 1959 (first flight as a Conv580 on 19 January 1960 as N5100). The one in the background is N900WC (c/n 110). Both aircraft were scrapped here during the early 1990s.