  It is known that the nonextensive statistics was originally formulated for
the systems composed of subsystems having same $q$. In this paper, the
existence of composite system with different $q$ subsystems is investigated by
fitting the power law degree distribution of air networks with $q$-exponential
distribution. Then a possible extension the nonextensive statistics to
different $q$ systems is provided on the basis of an entropy nonadditivity rule
and an unnormalized expectation of energy.
