The Fokker much like the Hawker Hurricane was a compromise: it had the new advanced monoplane layout married with the steel tube fuselage and wooden wings covered in cloth which betrayed it's Biplane origine.
The Junkers Ju 87 or Stuka was a two-man German dive bomber and ground-attack aircraft. Designed by Hermann Pohlmann, the Stuka first flew in 1935 and made its combat debut in 1936 as part of the Luftwaffe's Condor Legion during the Spanish Civil War.
Arado (Ar-79): This was a German monoplane of the 1930's, designed as an aerobatic two-seat trainer and touring aircraft. It had a retractable, tail-wheel undercarriage. The wings were constructed of fabric over plywood. The forward fuselage was of fabric over steel tube, and the rear fuselage was a monocoque structure.
Czechoslovak Avia 2 squadrons participated in the German Invasion of Poland escorting German in 8 sorties, losing 2 claiming 1 Polish liaison aircraft. Later also supported German forces in Ukraine, eventually withdrawn to anti-partisan