Inspirated from the idea of the Giant Seaplane, which Junkers designed at the end of WW I as transport seaboat, he advised Zindel in 1920 to start the design of a Giant passenger transport flying boat under the name Junkerssime. Two designs were developed, a sea and a land plane version. The seaplane design saw a double fuselage solution, where the two fuselages were the integrated floaters. About 40 to 60 passengers should be carried in the two fuselages over a range of 1900 to 2200 km.

The Junkerssime Landplane version had also two fuselages, but the passengers were located in the wing area. The two fuselages were just larger tail units. The Junkerssime Land was in sofar the prerunner of the J1000 and later on of the G38, which both had larger amounts of payloads in the wings.

The designs are more a study to evaluate the technological demand for the building of so large aircraft, than a real development project. They showed the future possibilities of commercial aviation.

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