Proposed revision of FAA medical standards is not an April Fools' Day joke.
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D000060:Accidents, Aviation / Q000517:prevention & control; D000328:Adult; D000367:Age Factors; D000368:Aged; D001359:Aviation / Q000592:standards*; D002568:Certification / Q000191:economics / Q000592:standards*; D006801:Humans; D008875:Middle Aged; D010808:Physical Examination; D014481:United States