Abstract: A folding assembled article in the form of a toy airplane has a fuselage of paper folded along a longitudinal line, a paper wing assembled with the fuselage and movable between a folded configuration, wherein the assembly is flat for packaging purposes, and an erect configuration, wherein the wing is in an extended lateral position relative to the fuselage for flight, and a locking member for locking the wing in the extended lateral position against inadvertent return to the folded configuration.