Miles M.30 UK Propeller Experimental 1942 Prototype 1 Rockwell B-1 Lancer USA Jet Bomber 1974 Production 104 Variable-sweep wing Tupolev Tu-160 USSR Jet Bomber 1981 Production 36 Variable-sweep wing Tupolev Tu-404 Russia Propeller Airliner 1991 Project 0 One of two alternatives studied Westland Dreadnought UK Propeller Transport 1924 Prototype 1 Mail plane.