  Future detectors of cosmic rays, such as EUSO and OWL, can test the Standard
Model predictions for the neutrino interactions at energies well beyond the
reach of any terrestrial experiment. The relative rates of horizontal and
upgoing air showers, combined with the angular distribution of upgoing air
showers will allow one to measure the neutrino-nucleon cross section at
center-of-mass energy 10^5 GeV or higher.
