However, based on a problem report, it appears the airport itself does not choose to brand itself under that identifier: "MDN is not associated with our airport. It’s just IMS. Please take the MDN information off or please send me where you are getting information so that I can get it corrected. I’m the airport manager for the airport and I have been tracking down the source of this misinformation. Thanks"
Since IATA, and not the airport, controls the IATA codes, we will be keeping that code here for now. It would be best if the airport authority reached out directly to IATA to have the "MDN" code deleted.
MDN comments
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Unusual IATA code "MDN" vs FAA LID "IMS"
🔗 Sat, 31 Oct 2020
— @david at Madison Municipal Airport, United States Reply
The IATA still assigns the code "MDN" to this airport: https://www.iata.org/en/publications/directories/code-search/?airport.search=MDN
However, based on a problem report, it appears the airport itself does not choose to brand itself under that identifier: "MDN is not associated with our airport. It’s just IMS. Please take the MDN information off or please send me where you are getting information so that I can get it corrected. I’m the airport manager for the airport and I have been tracking down the source of this misinformation. Thanks"
Since IATA, and not the airport, controls the IATA codes, we will be keeping that code here for now. It would be best if the airport authority reached out directly to IATA to have the "MDN" code deleted.