The Junkers Ju 390 was a German aircraft intended to be used as a heavy transport, maritime patrol aircraft, and long-range bomber, a long-range derivative of the Ju 290. It was one of the aircraft (along with the Messerschmitt Me 264 and Focke-Wulf Ta 400, and some time later, Heinkel's He 274) submitted for the abortive Amerika Bomber project.
Read more about Junkers Ju 390: Design and Development, Variants, Operators, Specifications (Ju 390 V1)