  We explore the physics of regular spinors in the Lounesto classification.
These spinors are constructed by introducing two chiral phases. One is a degree
of freedom present in choosing the $\gamma^{\mu}$ matrices that leaves the
Lorentz generators invariant. Another is a degree of freedom allowed by the
massive spin-half field that is unconstrained by Poincar\'{e} symmetry and
locality. By choosing appropriate values of the two phases, we obtain all the
classes of regular spinors. For the Dirac fermions, both phases are equal. We
argue that the chiral phase of the Standard Model fermions is a new set of
physical parameter. We find, the lepton chiral phases cannot be measured within
the weak interaction. For quarks, their phases are conjectured to be identical.
In general, to measure the phases between different fermionic generations would
require interactions beyond the Standard Model.
