  In this paper we investigate spectral flow symmetry in asymptotically flat
spacetimes both from a gravity as well as a putative dual quantum field theory
perspective. On the gravity side we consider models in Einstein gravity and
supergravity as well as their "reloaded" versions, present suitable boundary
conditions, determine the respective asymptotic symmetry algebras and the
thermal entropy of cosmological solutions in each of these models. On the
quantum field theory side we identify the spectral flow symmetry as
automorphisms of the underlying symmetry algebra of the theory. Using spectral
flow invariance we then determine the thermal entropy of these quantum field
theories and find perfect agreement with the results from the gravity side. In
addition we determine logarithmic corrections to the thermal entropy.
