Who owns the three letter airport codes? The FAA? The individual airport authorities? Anheuser-Busch?
According to Wikipaedia, the codes are provided by the International Air Association Transport Association.
Anheuser-Busch recently filed several dozen applications based on an intent to use airport abbreviation codes for “beer”. See list and links below – click TARR link for USPTO records.
I can think of several potential legal challenges to registration of these marks. I wonder how Anheuser-Busch intends to use them?