  We revisit the model of mesons as rotating strings with massive endpoints and
confront it with meson spectra. We look at Regge trajectories both in the
(J,M2) and (n,M2) planes, where J and n are the angular momentum and radial
excitation number respectively. We start from states comprised of u and d
quarks alone, move on to trajectories involving s and c quarks, and finally
analyze the trajectories of the heaviest observed b-bbar mesons. The endpoint
masses provide the needed transition between the linear Regge trajectories of
the light mesons to the deviations from linear behavior encountered for the
heavier mesons, all in the confines of the same simple model. From our fits we
extract the values of the quark endpoint masses, the Regge slope (string
tension) and quantum intercept. The model also allows for a universal fit where
with a single value of the Regge slope we fit all the (J,M2) trajectories
involving u, d, s, and c quarks. We include a list of predictions for higher
mesons in both J and n.
