  Scaling properties of nuclei- and photon-initiated air showers are examined
in wide primary energy range ($10^{14}\div 10^{22}$~eV) taking into account
Landau-Pomeranchuk-Migdal and geomagnetic field effects. It is shown that the
invariance in lateral distribution and also the universal dependence between
shower age and root mean square radius of electron component exist up to the
highest energies. The implications of shower universality for reanalysis,
cross-checking and validation of the results of different experiments together
with decreasing of the influence of hadronic model uncertainties are discussed
in detail.
