Press, 1997. . Stringfellow, Curtis K. and Peter M. Bowers. Lockheed Constellation: A Pictorial History. St. Paul, Minnesota: Motorbooks, 1992. . Swanborough, Gordon and Peter M. Bowers. US Navy Aircraft Since 1911. Annapolis, Maryland: Naval Institute Press, 1990. . Taylor, Michael J.H., ed. “Lockheed Constellation and Super Constellation.” Jane’s Encyclopedia of Aviation. New York: Crescent, 1993. . Yenne, Bill, Lockheed. Greenwich, Connecticut: Bison Books, 1987. . External links Lockheed EC-121D Constellation – National Museum of the United States Air Force Airborne Early Warning Association website Larry Westin EC-121R Batcat site Willy Victor (WV-2) Page Copy of Time Magazine article, April 25, 1969, on EC-121 shootdown EC-121 1940s United States special-purpose aircraft Four-engined tractor aircraft Low-wing aircraft AWACS aircraft EC-121 Four-engined piston aircraft Aircraft first flown in 1949 Triple-tail aircraft