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Recently in connection with Superstring theory E_8 and E_6 unificationsbecame very promising. In the present paper we have investigated a number ofavailable paths from the Standard Model (SM) to the E_6 unification,considering a chain of flipped models following the extension of the SM:  SU(3)_C\times SU(2)_L\times U(1)_Y \to  SU(3)_C\times SU(2)_L\times U(1)_X \times U(1)_Z \to  SU(5)\times U(1)_X \to  SU(5)\times U(1)_{Z1} \times U(1)_{X1} \to  SO(10) \times U(1)_{X1} \to  SO(10) \times U(1)_{Z2}\times U(1)_{X2} \to  E_6\times U(1)_{X2} or E_6,  Also we have considered a chain with a left-right symmetry:  SU(3)_C\times SU(2)_L\times U(1)_Y \to  SU(3)_C\times SU(2)_L \times SU(2)_R\times U(1)_X\times U(1)_Z \to  SU(4)_C\times SU(2)_L \times SU(2)_R\times U(1)_Z \to  SO(10)\times U(1)_Z \to  E_6.  We have presented four examples including non-supersymmetric andsupersymmetric extensions of the SM and different contents of the Higgs bosonsproviding the breaking of the flipped SO(10) and SU(5) down to the SM. It wasshown that the final unification E_6\times U(1) or E_6 at the (Planck) GUTscale M_{SSG} depends on the number of the Higgs boson representationsconsidered in theory.Comment: 25 pages, 7 figure

SEESAW SCALES AND STEPS FROM THE STANDARD MODEL TOWARDS SUPERSTRING-INSPIRED FLIPPED E6

SEESAW SCALES AND STEPS FROM THE STANDARD MODEL TOWARDS SUPERSTRING-INSPIRED FLIPPED E₆