  Kinetic Inductance Detectors (KID) are now routinely used in ground-based
telescopes. Large arrays, deployed in formats up to kilopixels, exhibit
state-of-the-art performance at millimeter (e.g. 120-300 GHz, NIKA and NIKA2 on
the IRAM 30-meters) and sub-millimeter (e.g. 350-850 GHz AMKID on APEX)
wavelengths. In view of future utilizations above the atmosphere, we have
studied in detail the interaction of ionizing particles with LEKID (Lumped
Element KID) arrays. We have constructed a dedicated cryogenic setup that
allows to reproduce the typical observing conditions of a space-borne
observatory. We will report the details and conclusions from a number of
measurements. We give a brief description of our short term project, consisting
in flying LEKID on a stratospheric balloon named B-SIDE.
