The Arado Ar 67 was the single-seat biplane fighter successor to the Ar 65.
The Ar 67 appeared in 1933 and was developed alongside the Ar 68. The Ar 67 was considerably smaller and lighter than the Ar 65. But the Ar 68 proved to be a better performer, and all further work on the Ar 67 was discontinued after only one prototype was built.
The Armstrong Whitworth Siskin was a British biplane single-seat fighter aircraft of the 1920s produced by Armstrong Whitworth Aircraft. The Siskin was one of the first new RAF fighters to enter service after the First World War, and was noted for its aerobatic qualities.
