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I dont know about your employers and their relation to fasting during crew duty time.. but the operators I've been in contact with strictly forbids fasting during flying. These rules are ofcource hard to enforce but most people seem to take it seriously and will hold of fasting during duty time. At my old flightschool only the christian students were alowed to fly solo after 12 o clock because they didnt trust the rest to uphold from fasting..and this was in the middle east...