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Since the launch of LHC experiments it has been discovered that the highmultiplicity trigger in pp, pA collisions finds events behaving differentlyfrom the typical (minimally biased) ones. In central pPb case it has beenproven that those possess collective phenomena known as the radial, ellipticand triangular flows, similar to what is known in heavy ion (AA) collisions. Inthis paper we argue that at the ultra-high energies, E_lab ~ 10^{20} eV, of theobserved cosmic rays this regime changes from a small-probability fluctuationto a dominant one. We estimate velocity of the transverse collective expansionfor the light-light and heavy-light collisions, and find it comparable to whatis observed at LHC for the central PbPb case. We argue that significant changesof spectra of various secondaries associated with this phenomenon should beimportant for the development of the cosmic ray cascades.

"Explosive regime" should dominate collisions of ultra-high energy cosmic rays