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We report on the performance of lumped--elements Kinetic Inductance Detector(KID) arrays for mm and sub--mm wavelengths, operated at 0.3K during thestratospheric flight of the OLIMPO payload, at an altitude of 37.8 km. We findthat the detectors can be tuned in-flight, and their performance is robustagainst radiative background changes due to varying telescope elevation. Wealso find that the noise equivalent power of the detectors in flight issignificantly reduced with respect to the one measured in the laboratory, andclose to photon-noise limited performance. The effect of primary cosmic rayscrossing the detector is found to be consistent with the expected ionizationenergy loss with phonon-mediated energy transfer from the ionization sites tothe resonators. In the OLIMPO detector arrays, at float, cosmic ray eventsaffect less than 4% of the detector samplings for all the pixels of all thearrays, and less than 1% of the samplings for most of the pixels. These resultsare also representative of what one can expect from primary cosmic rays in asatellite mission with similar KIDs and instrument environment.

Kinetic Inductance Detectors for the OLIMPO experiment: in--flight operation and performance