The invention relates to alloys and associated products which are laminated, extruded or forged in Al--Zn--Mg--Cu alloy. Alloys of the invention generally comprise (in mass percentage): a) Zn 8.3-14.0=Cu 0.3-4.0=Mg 0.5-4.5 Zr 0.03-0.15 Fe+Si<0.25 b) at least one element selected from the group consisting of Sc, Hf, La, Ti, Ce, Nd, Eu, Gd, Tb, Dy, Ho, Er, Y and Yb, the content of each elements; if included, being between 0.02 and 0.7%, and c) the aluminum remainder and inevitable impurities, and wherein Mg/Cu<2.4 and (7.7-0.4 Zn)>(Cu+Mg)>(6.4-0.4 Zn). Products of the present invention are useful as structural elements (for example wing unit caisson, wing unit extrados) in aeronautical construction.