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How about the airport with the narrowest runway, which only operates regional aircraft and smaller, which has precision approaches but no non-precision, which have an AWOS-3, even though they have a Non-Federal Control Tower, and must have pilot-controlled lighting?
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I'm just saying, chances are the shortest/narrowest runway is probably private, uncharted, and on the side of a mountain somewhere in Alaska. It's an impossible question to answer.