Once again , as it had done during the Norwegian Campaign in April 1940 .
Barbarossa in 1941 , the Luftwaffe 's Junkers Ju 52 transport fleet flew in supplies to keep the army going .
Once again , as it had done during the Norwegian Campaign in April 1940 , and Barbarossa in 1941 , the Luftwaffe 's Junkers Ju 52 transport fleet flew in supplies to keep the army going .