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FS2004 ATC Mods Armstrong Whitworth Siskin. ATC modifications for the Armstrong Whitworth Siskin. The Armstrong Whitworth Siskin was a British biplane single-seater fighter aircraft of the 1920's. The Siskin was one of the first new RAF fighters to enter service after the First World War; it was noted for its aerobatic qualities. First flew in 1919 the last deliveries were in 1931 to the RCAF. By Mike Stallwood.