  A combined interpretation of the CALET $e^+\, +\, e^-$ spectrum up to 3 TeV
and the AMS-02 positron spectrum up to 500 GeV was performed and the results
are discussed. To parametrize the background electron flux, we assume a
smoothly broken power-law spectrum with an exponential cut-off for electrons
and fit this parametrization to the measurements, with either a pulsar or
3-body decay of fermionic Dark Matter as the extra electron-positron pair
source responsible for the positron excess. We found that depending on the
parameters for the background, both Dark Matter decay and the pulsar model can
explain the combined measurements. While the Dark Matter decay scenario is
constrained by the Fermi-LAT $\gamma$-ray measurement, we show that 3-body
decay of a 800 GeV Dark Matter can be compatible with the $\gamma$-ray flux
measurement. We discuss the capability of CALET to discern decaying Dark Matter
models from a generic pulsar source scenario, based on simulated data for five
years of data-taking.
