What German aircraft designed by Seiegfried and Walter Günter at Heinkel Flugzeugwerke in 1934 was operated by Lehrgeschwader 1?
Lehrgeschwader 1 "Lehrgeschwader" 1 (LG 1) (Demonstration Wing 1) formerly "Lehrgeschwader Greifswald" was a Luftwaffe multi-purpose unit during World War II, operating fighter, bomber and dive-bomber "Gruppen". The unit was formed in July 1936 and operated the Messerschmitt Bf 109, Messerschmitt Bf 110, Dornier Do 17, Heinkel He 111, Junkers Ju 88 and Junkers Ju 87.
Heinkel HD 39 The Heinkel HD 39 was a special-purpose cargo aircraft developed in Germany in the 1920s to distribute the Berlin newspaper "B.Z.". It was a conventional single-bay biplane with staggered wings of equal span, and a fuselage that nearly filled the interplane gap. The pilot sat in an open cockpit, and the undercarriage was of fixed, tailskid type with divided main units. The sole example of the type was built after Ernst Heinkel found out, by chance, that "B.Z." required such an aircraft and had ordered two machines from Albatros. Heinkel convinced publisher Ullstein-Verlag to purchase a third aircraft from his firm.