  Delta(54) can serve as a flavor symmetry in particle physics, but remains
almost unexplored. We show that in a classification of semi-realistic Z3xZ3
heterotic string orbifolds, Delta(54) turns out to be the most natural flavor
symmetry, providing additional motivation for its study. We revisit its
phenomenological potential from a low-energy perspective and subject to the
constraints of string models. We find a model with Delta(54) arising from
heterotic orbifolds that leads to the Gatto-Sartori-Tonin relation for quarks
and charged-leptons. Additionally, in the neutrino sector, it leads to a normal
hierarchy for neutrino masses and a correlation between the reactor and the
atmospheric mixing angles, the latter taking values in the second octant and
being compatible at three sigmas with experimental data.
