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Complete solutions of the three-dimensional laminar boundary layer on a 15° half-angle blunted cone at angles of attack using Newtonian pressure distribution are presented. The method of calculation is a modification of the Raetz explicit finite-difference procedure. Results presented include inviscid and boundary-layer limiting streamlines, singular points of separation, and sample zones of dependence and influence. It has been found that the crossflow velocity derivative, which is neglected in the small crossflow theory, is actually large and dominates the three-dimensional boundary-layer separation process. Based on the influence principle, it is shown that solutions obtained by calculating along planes of symmetry is valid. Three-dimensional singular points of separation can be determined, but the complete region or an ordinary line of separation seems to require a more realistic specification of the pressure distribution than the Newtonian and/or the consideration of viscid-inviscid interaction.