This From Air & Space/Smithsonian Magazine: The Three-letter Airport Identifier For Sioux City, Iowa, Under Attack By State Officials, Will Be Changed.

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This from Air & Space/Smithsonian magazine:

The three-letter airport identifier for Sioux City, Iowa,
under attack by state officials, will be changed. The Federal
Aviation Administration has agreed that SUX is an unacceptable
abbreviation for the facility.

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