Convair design engineer Ladislao Pazmany produced PL-1 2-seater (23 March 1962) and formed Pazmany & Associates, later incorporated at San Diego as Pazmany Aircraft Corp., selling 395 sets of plans by 1977, and 35 built by Nationalist Chinese AF. Developed PL-2 (4 April 1969) was adopted by air forces of China, Indonesia, Vietnam, Sri Lanka, S. Korea and Thailand, and over 400 sets of plans sold to private individuals. PL-4A single-seater (12 July 1972) adopted by Air Cadets of Canada and other groups, plus 460 plans sold by 1975.