 He transferred to the "Deutsche Verkehrsfliegerschule" (German Air Transport School) in Braunschweig for pilot training on 1 March 1933.Weiß transferred to the Luftwaffe on 1 October 1934 holding the rank of "Oberleutnant" where he initially served as a technical officer with a reconnaissance squadron.From October 1936 to July 1938, now a "Hauptmann" (Captain), he served on the "Stab" of Jagdgeschwader 134 "Horst Wessel" (JG 134—134th Fighter Wing).