  We analyze the pi -> gamma* gamma* amplitude in the framework of radial Regge
models in the large-Nc limit. With the assumption of similarity of the
asymptotic Regge rho and omega meson spectra we find that the pion distribution
amplitude is constant in the large-$N_c$ limit at the scale Q0 where the QCD
radiative corrections are absent -- a result found earlier in a class of chiral
quark models. We discuss the constraints on the couplings from the anomaly and
from the limit of large photon virtualities, and find that the coupling of the
pion to excited rho and omega mesons must be asymptotically constant. We also
discuss the effects of the QCD evolution on the pion electromagnetic transition
form factor. Finally, we use the Regge model to evaluate the slope of the form
factor at zero momentum and compare the value to the experiment, finding very
reasonable agreement.
