One solution might be to encourage posters writing with airport codes to use the journalistic convention for the use of acronyms, even commonly known acronyms. That's to write the full name the first time, followed by the acronym (in parentheses), followed by the acronym alone in future references. I've tried to do that in my posts.

So what would be "A report from the U.S. Department of Transportation (DOT)...but DOT had no response to the complaints." could be done in a similar manner as "I flew into Chicago's O'Hare Airport (ORD). Now, due to road construction, leaving ORD by car is much harder than..."

Using airport codes in the titles of posts would be allowed for space reasons, just as newspapers put acronyms in headlines.