Convair YB-60
Hey! I finally stumped everybody on one! Yeah for me!
Sorry. The correct answer is the
Baade 152. The Baade 152 also known as Dresden 152, VL-DDR 152 or simply 152 was the first German jet passenger airliner. It was built and tested in Dresden (East Germany) between 1956 and 1961, but failed to enter service. The "152" represents the final development in the Junkers aircraft family which ended with the "development planes" (Entwicklungsflugzeug - EF).
Try this one next.