  We compare the entropy as a function of energy of excited strings and black
strings in an asymptotically plane wave background at the level of the
correspondence principle. For the plane wave supported by the NSNS 3-form flux,
neither the entropy formula nor the cross-over scale is affected by the
presence of the flux and the correspondence is found to hold. For the plane
wave supported by the RR 3-form flux, both the entropy and the cross-over point
are modified, but the correspondence is still found to hold.
