  We study the flux parameter spaces for semi-realistic supersymmetric
Pati-Salam models in the AdS vacua on Type IIA orientifold and realistic
supersymmetric Pati-Salam models in the Minkowski vacua on Type IIB
orientifold. Because the fluxes can be very large, we show explicitly that
there indeed exists a huge number of semi-realistic Type IIA and realistic Type
IIB flux models. In the Type IIA flux models, in the very large flux limit, the
theory can become weakly coupled and the AdS vacua can approach to the
Minkowski vacua. In a series of realistic Type IIB flux models, at the string
scale, the gauge symmetry can be broken down to the Standard Model (SM) gauge
symmetry, the gauge coupling unification can be achieved naturally, all the
extra chiral exotic particles can be decoupled, and the observed SM fermion
masses and mixings can be obtained as well. In particular, the real parts of
the dilaton, K\"ahler moduli, and the unified gauge coupling are independent of
the very large fluxes. The very large fluxes only affect the real and/or
imaginary parts of the complex structure moduli, and/or the imaginary parts of
the dilaton and K\"ahler moduli. However, these semi-realistic Type IIA and
realistic Type IIB flux models can not be populated in the string landscape.
