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special air-reports
meteorol. aeronotificaciones especiales
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special air-report
avia., Canada Special observations made by aircraft operating on international air routes whenever a severe turbulence or severe icing is encountered; b moderate turbulence, hail or cumulonimbus clouds are encountered during transonic or supersonic flight; or c other meteorological conditions, for example, the other en route weather phenomena specified for SIGMET messages, are encountered that, in the opinion of the pilot-in-command, may affect the safety or markedly affect the efficiency of other aircraft operations