The failure of pilots to pass pre-flight alcohol tests caused delays to 16 flights operated by Japan Airlines Co. and its two group companies since April last year, a survey covering 20 major domestic airlines showed Thursday.The questionnaire was conducted by Kyodo News following the revelation of a spate of alcohol test failures in the aviation industry, including a case that resulted in the arrest of a co-pilot. The figure does not include the case involving arrest or the latest incident at Skymark Airlines Inc. announced Wednesday.Of the 16 flights, 12 were of JAL, three were of J-Air C…READ FULL ARTICLE