We explain how the spectral flow operator normally acting within a general (2,2) theory can be used as a map between (2,0) models. The space of (2,0) models is of particular interest among all heterotic-string models for two important reasons: i)N=1 spacetime SUSY requires (2,0) superconformal invariance and ii)models with the minimal SO(10) unification structure, which is well motivated by the Standard Model of particle physics data, are of this type. This idea was inspired by a new symmetry in the space of fermionic Z2×Z2 heterotic-string models that exchanges the spinors and vectors of the SO(10) GUT group, dubbed spinor-vector duality. Such symmetries are important for the understanding of the landscape of string vacua and ultimately for the possible operation of a dynamical vacuum selection mechanism in string theory. We will describe how to generalize these ideas to arbitrary internal Conformal Field Theories (CFTs).