Messerschmitt Me 264 (an all-new design, and the first one built and flown, submitted in May 1942), Focke-Wulf Ta 400, Junkers Ju 390 (based on the Ju 290, the second and last built and flown, with the Ju 290 itself submitted in May 1942), and Heinkel He 277 (as it underwent ongoing engineering development through 1943, itself first specified by its RLM airframe number by February 1943).[1]