  The two-loop quark Regge trajectory is obtained at arbitrary space-time
dimension D using the s-channel unitarity conditions. Although explicit
calculations are performed for massless quarks, the method used allows to find
the trajectory for massive quarks as well. At D->4 the trajectory turns into
one derived earlier from the high-energy limit of the two-loop amplitude for
the quark-gluon scattering. The comparison of two expressions, obtained by
quite different methods, serves as a strict cross check of many intermediate
results used in the calculations, and their agreement gives a strong evidence
of accuracy of these results.
