  We report a measurement of the flux of cosmic rays with unprecedented
precision and statistics using data from the Pierre Auger Observatory. Based on
fluorescence observations in coincidence with at least one station of the
surface detector we derive a spectrum for energies above 1 EeV. We also report
on the energy spectra obtained with the surface detector array. The spectral
features are presented in detail and the impact of systematic uncertainties on
these features are addressed.
